diff --git a/Makefile.am b/Makefile.am
index 2b7f2c231..428afda62 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -12,8 +12,8 @@ pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libzcashconsensus.pc
 endif
 
-BITCOIND_BIN=$(top_builddir)/src/hushd$(EXEEXT)
-BITCOIN_CLI_BIN=$(top_builddir)/src/hush-cli$(EXEEXT)
+BITCOIND_BIN=$(top_builddir)/src/$(BITCOIN_DAEMON_NAME)$(EXEEXT)
+BITCOIN_CLI_BIN=$(top_builddir)/src/$(BITCOIN_CLI_NAME)$(EXEEXT)
 WALLET_UTILITY_BIN=$(top_builddir)/src/wallet-utility$(EXEEXT)
 BITCOIN_WIN_INSTALLER=$(PACKAGE)-$(PACKAGE_VERSION)-win$(WINDOWS_BITS)-setup$(EXEEXT)
 
@@ -42,9 +42,9 @@ WINDOWS_PACKAGING = $(top_srcdir)/share/pixmaps/bitcoin.ico \
 ##  $(top_srcdir)/contrib/macdeploy/detached-sig-apply.sh \
 ##  $(top_srcdir)/contrib/macdeploy/detached-sig-create.sh
 
-COVERAGE_INFO = baseline_filtered_combined.info baseline.info block_test.info \
+COVERAGE_INFO = baseline_filtered_combined.info baseline.info \
   leveldb_baseline.info test_bitcoin_filtered.info total_coverage.info \
-  baseline_filtered.info block_test_filtered.info \
+  baseline_filtered.info \
   leveldb_baseline_filtered.info test_bitcoin_coverage.info test_bitcoin.info \
   zcash-gtest.info zcash-gtest_filtered.info zcash-gtest_coverage.info
 
@@ -220,33 +220,14 @@ zcash-gtest_filtered.info: zcash-gtest.info
                       "$(abs_builddir)/src/wallet/test/*" \
                       -o $@
 
-block_test.info: test_bitcoin_filtered.info
-	$(MKDIR_P) qa/tmp
-	-@TIMEOUT=15 qa/pull-tester/run-bitcoind-for-test.sh $(JAVA) -jar $(JAVA_COMPARISON_TOOL) qa/tmp/compTool 0
-	$(LCOV) -c -d $(abs_builddir)/src --t BitcoinJBlockTest -o $@
-	$(LCOV) -z -d $(abs_builddir)/src
-	$(LCOV) -z -d $(abs_builddir)/src/leveldb
-
-block_test_filtered.info: block_test.info
-	$(LCOV) -r $< "/usr/include/*" \
-                      "$(abs_builddir)/depends/x86_64-unknown-linux-gnu/include/*.h" \
-                      "$(abs_builddir)/depends/x86_64-unknown-linux-gnu/include/boost/*" \
-                      "$(abs_builddir)/depends/x86_64-unknown-linux-gnu/include/gmock/*" \
-                      "$(abs_builddir)/depends/x86_64-unknown-linux-gnu/include/gtest/*" \
-                      "$(abs_builddir)/src/gtest/*" \
-                      "$(abs_builddir)/src/test/*" \
-                      "$(abs_builddir)/src/wallet/gtest/*" \
-                      "$(abs_builddir)/src/wallet/test/*" \
-                      -o $@
-
 test_bitcoin_coverage.info: baseline_filtered_combined.info test_bitcoin_filtered.info
 	$(LCOV) -a baseline_filtered.info -a leveldb_baseline_filtered.info -a test_bitcoin_filtered.info -o $@
 
 zcash-gtest_coverage.info: baseline_filtered_combined.info zcash-gtest_filtered.info
 	$(LCOV) -a baseline_filtered.info -a leveldb_baseline_filtered.info -a zcash-gtest_filtered.info -o $@
 
-total_coverage.info:  baseline_filtered_combined.info test_bitcoin_filtered.info zcash-gtest_filtered.info block_test_filtered.info
-	$(LCOV) -a baseline_filtered.info -a leveldb_baseline_filtered.info -a test_bitcoin_filtered.info -a zcash-gtest_filtered.info -a block_test_filtered.info -o $@ | $(GREP) "\%" | $(AWK) '{ print substr($$3,2,50) "/" $$5 }' > coverage_percent.txt
+total_coverage.info:  baseline_filtered_combined.info test_bitcoin_filtered.info zcash-gtest_filtered.info
+	$(LCOV) -a baseline_filtered.info -a leveldb_baseline_filtered.info -a test_bitcoin_filtered.info -a zcash-gtest_filtered.info -o $@ | $(GREP) "\%" | $(AWK) '{ print substr($$3,2,50) "/" $$5 }' > coverage_percent.txt
 
 test_bitcoin.coverage/.dirstamp:  test_bitcoin_coverage.info
 	$(GENHTML) -s $< -o $(@D)
@@ -266,12 +247,6 @@ cov: test_bitcoin.coverage/.dirstamp cov-zcash total.coverage/.dirstamp
 
 endif
 
-if USE_COMPARISON_TOOL
-check-local:
-	$(MKDIR_P) qa/tmp
-	@qa/pull-tester/run-bitcoind-for-test.sh $(JAVA) -jar $(JAVA_COMPARISON_TOOL) qa/tmp/compTool $(COMPARISON_TOOL_REORG_TESTS) 2>&1
-endif
-
 dist_bin_SCRIPTS = zcutil/fetch-params.sh
 dist_noinst_SCRIPTS = autogen.sh zcutil/build-debian-package.sh zcutil/build.sh
 
diff --git a/build-aux/m4/ax_boost_base.m4 b/build-aux/m4/ax_boost_base.m4
index 3f24d5ddc..45d948933 100644
--- a/build-aux/m4/ax_boost_base.m4
+++ b/build-aux/m4/ax_boost_base.m4
@@ -33,7 +33,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 23
+#serial 26
 
 AC_DEFUN([AX_BOOST_BASE],
 [
@@ -95,8 +95,8 @@ if test "x$want_boost" = "xyes"; then
       x86_64)
         libsubdirs="lib64 libx32 lib lib64"
         ;;
-      ppc64|s390x|sparc64|aarch64)
-        libsubdirs="lib64 lib lib64"
+      ppc64|s390x|sparc64|aarch64|ppc64le)
+        libsubdirs="lib64 lib lib64 ppc64le"
         ;;
     esac
 
@@ -170,7 +170,7 @@ if test "x$want_boost" = "xyes"; then
         AC_MSG_RESULT(yes)
     succeeded=yes
     found_system=yes
-        ],[:
+        ],[
         ])
     AC_LANG_POP([C++])
 
@@ -179,6 +179,10 @@ if test "x$want_boost" = "xyes"; then
     dnl if we found no boost with system layout we search for boost libraries
     dnl built and installed without the --layout=system option or for a staged(not installed) version
     if test "x$succeeded" != "xyes"; then
+        CPPFLAGS="$CPPFLAGS_SAVED"
+        LDFLAGS="$LDFLAGS_SAVED"
+        BOOST_CPPFLAGS=
+        BOOST_LDFLAGS=
         _version=0
         if test "$ac_boost_path" != ""; then
             if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
@@ -191,6 +195,12 @@ if test "x$want_boost" = "xyes"; then
                     VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
                     BOOST_CPPFLAGS="-I$ac_boost_path/include/boost-$VERSION_UNDERSCORE"
                 done
+                dnl if nothing found search for layout used in Windows distributions
+                if test -z "$BOOST_CPPFLAGS"; then
+                    if test -d "$ac_boost_path/boost" && test -r "$ac_boost_path/boost"; then
+                        BOOST_CPPFLAGS="-I$ac_boost_path"
+                    fi
+                fi
             fi
         else
             if test "$cross_compiling" != yes; then
@@ -253,7 +263,7 @@ if test "x$want_boost" = "xyes"; then
             AC_MSG_RESULT(yes)
         succeeded=yes
         found_system=yes
-            ],[:
+            ],[
             ])
         AC_LANG_POP([C++])
     fi
diff --git a/build-aux/m4/ax_boost_program_options.m4 b/build-aux/m4/ax_boost_program_options.m4
index f59144185..2bdb59371 100644
--- a/build-aux/m4/ax_boost_program_options.m4
+++ b/build-aux/m4/ax_boost_program_options.m4
@@ -29,7 +29,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 22
+#serial 24
 
 AC_DEFUN([AX_BOOST_PROGRAM_OPTIONS],
 [
@@ -63,9 +63,9 @@ AC_DEFUN([AX_BOOST_PROGRAM_OPTIONS],
 		AC_CACHE_CHECK([whether the Boost::Program_Options library is available],
 					   ax_cv_boost_program_options,
 					   [AC_LANG_PUSH(C++)
-				AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/program_options.hpp>
+				AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/program_options/errors.hpp>
                                                           ]],
-                                  [[boost::program_options::options_description generic("Generic options");
+                                  [[boost::program_options::error err("Error message");
                                    return 0;]])],
                            ax_cv_boost_program_options=yes, ax_cv_boost_program_options=no)
 					AC_LANG_POP([C++])
@@ -74,7 +74,6 @@ AC_DEFUN([AX_BOOST_PROGRAM_OPTIONS],
 				AC_DEFINE(HAVE_BOOST_PROGRAM_OPTIONS,,[define if the Boost::PROGRAM_OPTIONS library is available])
                   BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
                 if test "x$ax_boost_user_program_options_lib" = "x"; then
-                ax_lib=
                 for libextension in `ls $BOOSTLIBDIR/libboost_program_options*.so* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_program_options.*\)\.so.*$;\1;'` `ls $BOOSTLIBDIR/libboost_program_options*.dylib* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_program_options.*\)\.dylib.*$;\1;'` `ls $BOOSTLIBDIR/libboost_program_options*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_program_options.*\)\.a.*$;\1;'` ; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
diff --git a/build-aux/m4/ax_boost_system.m4 b/build-aux/m4/ax_boost_system.m4
index 9c78280fc..1c05450cb 100644
--- a/build-aux/m4/ax_boost_system.m4
+++ b/build-aux/m4/ax_boost_system.m4
@@ -31,7 +31,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 17
+#serial 18
 
 AC_DEFUN([AX_BOOST_SYSTEM],
 [
@@ -68,9 +68,10 @@ AC_DEFUN([AX_BOOST_SYSTEM],
 					   ax_cv_boost_system,
         [AC_LANG_PUSH([C++])
 			 CXXFLAGS_SAVE=$CXXFLAGS
+			 CXXFLAGS=
 
 			 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/system/error_code.hpp>]],
-                                   [[boost::system::system_category]])],
+				    [[boost::system::error_category *a = 0;]])],
                    ax_cv_boost_system=yes, ax_cv_boost_system=no)
 			 CXXFLAGS=$CXXFLAGS_SAVE
              AC_LANG_POP([C++])
diff --git a/build-aux/m4/ax_check_compile_flag.m4 b/build-aux/m4/ax_check_compile_flag.m4
index c3a8d695a..ca3639715 100644
--- a/build-aux/m4/ax_check_compile_flag.m4
+++ b/build-aux/m4/ax_check_compile_flag.m4
@@ -4,7 +4,7 @@
 #
 # SYNOPSIS
 #
-#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
@@ -19,6 +19,8 @@
 #   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
 #   force the compiler to issue an error when a bad flag is given.
 #
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
 #   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
 #
@@ -53,19 +55,19 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 2
+#serial 4
 
 AC_DEFUN([AX_CHECK_COMPILE_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
   ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
   _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
-  AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
     [AS_VAR_SET(CACHEVAR,[yes])],
     [AS_VAR_SET(CACHEVAR,[no])])
   _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+AS_VAR_IF(CACHEVAR,yes,
   [m4_default([$2], :)],
   [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
diff --git a/build-aux/m4/ax_check_link_flag.m4 b/build-aux/m4/ax_check_link_flag.m4
index e2d0d363e..eb01a6ce1 100644
--- a/build-aux/m4/ax_check_link_flag.m4
+++ b/build-aux/m4/ax_check_link_flag.m4
@@ -4,7 +4,7 @@
 #
 # SYNOPSIS
 #
-#   AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+#   AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
@@ -19,6 +19,8 @@
 #   EXTRA-FLAGS FLAG".  This can for example be used to force the linker to
 #   issue an error when a bad flag is given.
 #
+#   INPUT gives an alternative input source to AC_LINK_IFELSE.
+#
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
 #   macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG.
 #
@@ -53,18 +55,19 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 2
+#serial 4
 
 AC_DEFUN([AX_CHECK_LINK_FLAG],
-[AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
 AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
   ax_check_save_flags=$LDFLAGS
   LDFLAGS="$LDFLAGS $4 $1"
-  AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+  AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
     [AS_VAR_SET(CACHEVAR,[yes])],
     [AS_VAR_SET(CACHEVAR,[no])])
   LDFLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+AS_VAR_IF(CACHEVAR,yes,
   [m4_default([$2], :)],
   [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
diff --git a/build-aux/m4/ax_check_preproc_flag.m4 b/build-aux/m4/ax_check_preproc_flag.m4
index b1cfef6b8..ca1d5ee2b 100644
--- a/build-aux/m4/ax_check_preproc_flag.m4
+++ b/build-aux/m4/ax_check_preproc_flag.m4
@@ -4,7 +4,7 @@
 #
 # SYNOPSIS
 #
-#   AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+#   AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
@@ -19,6 +19,8 @@
 #   "CPPFLAGS EXTRA-FLAGS FLAG".  This can for example be used to force the
 #   preprocessor to issue an error when a bad flag is given.
 #
+#   INPUT gives an alternative input source to AC_PREPROC_IFELSE.
+#
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
 #   macro in sync with AX_CHECK_{COMPILE,LINK}_FLAG.
 #
@@ -53,19 +55,19 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 2
+#serial 4
 
 AC_DEFUN([AX_CHECK_PREPROC_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnl
 AC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [
   ax_check_save_flags=$CPPFLAGS
   CPPFLAGS="$CPPFLAGS $4 $1"
-  AC_PREPROC_IFELSE([AC_LANG_PROGRAM()],
+  AC_PREPROC_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
     [AS_VAR_SET(CACHEVAR,[yes])],
     [AS_VAR_SET(CACHEVAR,[no])])
   CPPFLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+AS_VAR_IF(CACHEVAR,yes,
   [m4_default([$2], :)],
   [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
diff --git a/build-aux/m4/ax_cxx_compile_stdcxx.m4 b/build-aux/m4/ax_cxx_compile_stdcxx.m4
new file mode 100644
index 000000000..f147cee3b
--- /dev/null
+++ b/build-aux/m4/ax_cxx_compile_stdcxx.m4
@@ -0,0 +1,568 @@
+# ===========================================================================
+#   http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
+#
+# DESCRIPTION
+#
+#   Check for baseline language coverage in the compiler for the specified
+#   version of the C++ standard.  If necessary, add switches to CXX and
+#   CXXCPP to enable support.  VERSION may be '11' (for the C++11 standard)
+#   or '14' (for the C++14 standard).
+#
+#   The second argument, if specified, indicates whether you insist on an
+#   extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
+#   -std=c++11).  If neither is specified, you get whatever works, with
+#   preference for an extended mode.
+#
+#   The third argument, if specified 'mandatory' or if left unspecified,
+#   indicates that baseline support for the specified C++ standard is
+#   required and that the macro should error out if no mode with that
+#   support is found.  If specified 'optional', then configuration proceeds
+#   regardless, after defining HAVE_CXX${VERSION} if and only if a
+#   supporting mode is found.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
+#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
+#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
+#   Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
+#   Copyright (c) 2015 Paul Norman <penorman@mac.com>
+#   Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.  This file is offered as-is, without any
+#   warranty.
+
+#serial 4
+
+dnl  This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
+dnl  (serial version number 13).
+
+AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
+  m4_if([$1], [11], [],
+        [$1], [14], [],
+        [$1], [17], [m4_fatal([support for C++17 not yet implemented in AX_CXX_COMPILE_STDCXX])],
+        [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
+  m4_if([$2], [], [],
+        [$2], [ext], [],
+        [$2], [noext], [],
+        [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
+  m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
+        [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
+        [$3], [optional], [ax_cxx_compile_cxx$1_required=false],
+        [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
+  m4_if([$4], [], [ax_cxx_compile_cxx$1_try_default=true],
+        [$4], [default], [ax_cxx_compile_cxx$1_try_default=true],
+        [$4], [nodefault], [ax_cxx_compile_cxx$1_try_default=false],
+        [m4_fatal([invalid fourth argument `$4' to AX_CXX_COMPILE_STDCXX])])
+  AC_LANG_PUSH([C++])dnl
+  ac_success=no
+
+  m4_if([$4], [nodefault], [], [dnl
+  AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
+  ax_cv_cxx_compile_cxx$1,
+  [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+    [ax_cv_cxx_compile_cxx$1=yes],
+    [ax_cv_cxx_compile_cxx$1=no])])
+  if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
+    ac_success=yes
+  fi])
+
+  m4_if([$2], [noext], [], [dnl
+  if test x$ac_success = xno; then
+    for switch in -std=gnu++$1 -std=gnu++0x; do
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+                     $cachevar,
+        [ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXX="$ac_save_CXX"])
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+
+  m4_if([$2], [ext], [], [dnl
+  if test x$ac_success = xno; then
+    dnl HP's aCC needs +std=c++11 according to:
+    dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
+    dnl Cray's crayCC needs "-h std=c++11"
+    for switch in -std=c++$1 -std=c++0x +std=c++$1 "-h std=c++$1"; do
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+                     $cachevar,
+        [ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXX="$ac_save_CXX"])
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+  AC_LANG_POP([C++])
+  if test x$ax_cxx_compile_cxx$1_required = xtrue; then
+    if test x$ac_success = xno; then
+      AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
+    fi
+  fi
+  if test x$ac_success = xno; then
+    HAVE_CXX$1=0
+    AC_MSG_NOTICE([No compiler with C++$1 support was found])
+  else
+    HAVE_CXX$1=1
+    AC_DEFINE(HAVE_CXX$1,1,
+              [define if the compiler supports basic C++$1 syntax])
+  fi
+  AC_SUBST(HAVE_CXX$1)
+])
+
+
+dnl  Test body for checking C++11 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+)
+
+
+dnl  Test body for checking C++14 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
+)
+
+
+dnl  Tests for new features in C++11
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+]])
+
+
+dnl  Tests for new features in C++14
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
+
+// If the compiler admits that it is not ready for C++14, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201402L
+
+#error "This is not a C++14 compiler"
+
+#else
+
+namespace cxx14
+{
+
+  namespace test_polymorphic_lambdas
+  {
+
+    int
+    test()
+    {
+      const auto lambda = [](auto&&... args){
+        const auto istiny = [](auto x){
+          return (sizeof(x) == 1UL) ? 1 : 0;
+        };
+        const int aretiny[] = { istiny(args)... };
+        return aretiny[0];
+      };
+      return lambda(1, 1L, 1.0f, '1');
+    }
+
+  }
+
+  namespace test_binary_literals
+  {
+
+    constexpr auto ivii = 0b0000000000101010;
+    static_assert(ivii == 42, "wrong value");
+
+  }
+
+  namespace test_generalized_constexpr
+  {
+
+    template < typename CharT >
+    constexpr unsigned long
+    strlen_c(const CharT *const s) noexcept
+    {
+      auto length = 0UL;
+      for (auto p = s; *p; ++p)
+        ++length;
+      return length;
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("x") == 1UL, "");
+    static_assert(strlen_c("test") == 4UL, "");
+    static_assert(strlen_c("another\0test") == 7UL, "");
+
+  }
+
+  namespace test_lambda_init_capture
+  {
+
+    int
+    test()
+    {
+      auto x = 0;
+      const auto lambda1 = [a = x](int b){ return a + b; };
+      const auto lambda2 = [a = lambda1(x)](){ return a; };
+      return lambda2();
+    }
+
+  }
+
+  namespace test_digit_seperators
+  {
+
+    constexpr auto ten_million = 100'000'000;
+    static_assert(ten_million == 100000000, "");
+
+  }
+
+  namespace test_return_type_deduction
+  {
+
+    auto f(int& x) { return x; }
+    decltype(auto) g(int& x) { return x; }
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static constexpr auto value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static constexpr auto value = true;
+    };
+
+    int
+    test()
+    {
+      auto x = 0;
+      static_assert(is_same<int, decltype(f(x))>::value, "");
+      static_assert(is_same<int&, decltype(g(x))>::value, "");
+      return x;
+    }
+
+  }
+
+}  // namespace cxx14
+
+#endif  // __cplusplus >= 201402L
+
+]])
diff --git a/build-aux/m4/ax_gcc_func_attribute.m4 b/build-aux/m4/ax_gcc_func_attribute.m4
index 275ca63a2..c788ca9bd 100644
--- a/build-aux/m4/ax_gcc_func_attribute.m4
+++ b/build-aux/m4/ax_gcc_func_attribute.m4
@@ -31,6 +31,7 @@
 #    cold
 #    const
 #    constructor
+#    constructor_priority for constructor attribute with priority
 #    deprecated
 #    destructor
 #    dllexport
@@ -73,7 +74,7 @@
 #   and this notice are preserved.  This file is offered as-is, without any
 #   warranty.
 
-#serial 2
+#serial 3
 
 AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
     AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1])
@@ -103,6 +104,9 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
                 [const], [
                     int foo( void ) __attribute__(($1));
                 ],
+                [constructor_priority], [
+                    int foo( void ) __attribute__((__constructor__(65535/2)));
+                ],
                 [constructor], [
                     int foo( void ) __attribute__(($1));
                 ],
@@ -180,6 +184,8 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
                 [visibility], [
                     int foo_def( void ) __attribute__(($1("default")));
                     int foo_hid( void ) __attribute__(($1("hidden")));
+                    int foo_int( void ) __attribute__(($1("internal")));
+                    int foo_pro( void ) __attribute__(($1("protected")));
                 ],
                 [warning], [
                     int foo( void ) __attribute__(($1("")));
diff --git a/build-aux/m4/ax_openmp.m4 b/build-aux/m4/ax_openmp.m4
new file mode 100644
index 000000000..866e1d664
--- /dev/null
+++ b/build-aux/m4/ax_openmp.m4
@@ -0,0 +1,123 @@
+# ===========================================================================
+#        https://www.gnu.org/software/autoconf-archive/ax_openmp.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_OPENMP([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+#
+# DESCRIPTION
+#
+#   This macro tries to find out how to compile programs that use OpenMP a
+#   standard API and set of compiler directives for parallel programming
+#   (see http://www-unix.mcs/)
+#
+#   On success, it sets the OPENMP_CFLAGS/OPENMP_CXXFLAGS/OPENMP_F77FLAGS
+#   output variable to the flag (e.g. -omp) used both to compile *and* link
+#   OpenMP programs in the current language.
+#
+#   NOTE: You are assumed to not only compile your program with these flags,
+#   but also link it with them as well.
+#
+#   If you want to compile everything with OpenMP, you should set:
+#
+#     CFLAGS="$CFLAGS $OPENMP_CFLAGS"
+#     #OR#  CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS"
+#     #OR#  FFLAGS="$FFLAGS $OPENMP_FFLAGS"
+#
+#   (depending on the selected language).
+#
+#   The user can override the default choice by setting the corresponding
+#   environment variable (e.g. OPENMP_CFLAGS).
+#
+#   ACTION-IF-FOUND is a list of shell commands to run if an OpenMP flag is
+#   found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it is
+#   not found. If ACTION-IF-FOUND is not specified, the default action will
+#   define HAVE_OPENMP.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
+#   Copyright (c) 2015 John W. Peterson <jwpeterson@gmail.com>
+#   Copyright (c) 2016 Nick R. Papior <nickpapior@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 13
+
+AC_DEFUN([AX_OPENMP], [
+AC_PREREQ([2.69]) dnl for _AC_LANG_PREFIX
+
+AC_CACHE_CHECK([for OpenMP flag of _AC_LANG compiler], ax_cv_[]_AC_LANG_ABBREV[]_openmp, [save[]_AC_LANG_PREFIX[]FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
+ax_cv_[]_AC_LANG_ABBREV[]_openmp=unknown
+# Flags to try:  -fopenmp (gcc), -mp (SGI & PGI),
+#                -qopenmp (icc>=15), -openmp (icc),
+#                -xopenmp (Sun), -omp (Tru64),
+#                -qsmp=omp (AIX),
+#                none
+ax_openmp_flags="-fopenmp -openmp -qopenmp -mp -xopenmp -omp -qsmp=omp none"
+if test "x$OPENMP_[]_AC_LANG_PREFIX[]FLAGS" != x; then
+  ax_openmp_flags="$OPENMP_[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flags"
+fi
+for ax_openmp_flag in $ax_openmp_flags; do
+  case $ax_openmp_flag in
+    none) []_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[] ;;
+    *) []_AC_LANG_PREFIX[]FLAGS="$save[]_AC_LANG_PREFIX[]FLAGS $ax_openmp_flag" ;;
+  esac
+  AC_LINK_IFELSE([AC_LANG_SOURCE([[
+@%:@include <omp.h>
+
+static void
+parallel_fill(int * data, int n)
+{
+  int i;
+@%:@pragma omp parallel for
+  for (i = 0; i < n; ++i)
+    data[i] = i;
+}
+
+int
+main()
+{
+  int arr[100000];
+  omp_set_num_threads(2);
+  parallel_fill(arr, 100000);
+  return 0;
+}
+]])],[ax_cv_[]_AC_LANG_ABBREV[]_openmp=$ax_openmp_flag; break],[])
+done
+[]_AC_LANG_PREFIX[]FLAGS=$save[]_AC_LANG_PREFIX[]FLAGS
+])
+if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" = "xunknown"; then
+  m4_default([$2],:)
+else
+  if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" != "xnone"; then
+    OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ax_cv_[]_AC_LANG_ABBREV[]_openmp
+  fi
+  m4_default([$1], [AC_DEFINE(HAVE_OPENMP,1,[Define if OpenMP is enabled])])
+fi
+])dnl AX_OPENMP
diff --git a/build-aux/m4/ax_pthread.m4 b/build-aux/m4/ax_pthread.m4
index d383ad5c6..d218d1af7 100644
--- a/build-aux/m4/ax_pthread.m4
+++ b/build-aux/m4/ax_pthread.m4
@@ -19,10 +19,10 @@
 #   is necessary on AIX to use the special cc_r compiler alias.)
 #
 #   NOTE: You are assumed to not only compile your program with these flags,
-#   but also link it with them as well. e.g. you should link with
+#   but also to link with them as well. For example, you might link with
 #   $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
 #
-#   If you are only building threads programs, you may wish to use these
+#   If you are only building threaded programs, you may wish to use these
 #   variables in your default LIBS, CFLAGS, and CC:
 #
 #     LIBS="$PTHREAD_LIBS $LIBS"
@@ -30,8 +30,8 @@
 #     CC="$PTHREAD_CC"
 #
 #   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
-#   has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
-#   (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
+#   has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to
+#   that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
 #
 #   Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
 #   PTHREAD_PRIO_INHERIT symbol is defined when compiling with
@@ -82,35 +82,40 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 21
+#serial 22
 
 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
 AC_DEFUN([AX_PTHREAD], [
 AC_REQUIRE([AC_CANONICAL_HOST])
+AC_REQUIRE([AC_PROG_CC])
+AC_REQUIRE([AC_PROG_SED])
 AC_LANG_PUSH([C])
 ax_pthread_ok=no
 
 # We used to check for pthread.h first, but this fails if pthread.h
-# requires special compiler flags (e.g. on True64 or Sequent).
+# requires special compiler flags (e.g. on Tru64 or Sequent).
 # It gets checked for in the link test anyway.
 
 # First of all, check if the user has set any of the PTHREAD_LIBS,
 # etcetera environment variables, and if threads linking works using
 # them:
-if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
-        save_CFLAGS="$CFLAGS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-        save_LIBS="$LIBS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
-        AC_TRY_LINK_FUNC([pthread_join], [ax_pthread_ok=yes])
-        AC_MSG_RESULT([$ax_pthread_ok])
-        if test x"$ax_pthread_ok" = xno; then
-                PTHREAD_LIBS=""
-                PTHREAD_CFLAGS=""
-        fi
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
+if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
+	ax_pthread_save_CC="$CC"
+	ax_pthread_save_CFLAGS="$CFLAGS"
+	ax_pthread_save_LIBS="$LIBS"
+	AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
+	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+	LIBS="$PTHREAD_LIBS $LIBS"
+	AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
+	AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
+	AC_MSG_RESULT([$ax_pthread_ok])
+	if test "x$ax_pthread_ok" = "xno"; then
+		PTHREAD_LIBS=""
+		PTHREAD_CFLAGS=""
+	fi
+	CC="$ax_pthread_save_CC"
+	CFLAGS="$ax_pthread_save_CFLAGS"
+	LIBS="$ax_pthread_save_LIBS"
 fi
 
 # We must check for the threads library under a number of different
@@ -123,7 +128,7 @@ fi
 # which indicates that we try without any flags at all, and "pthread-config"
 # which is a program returning the flags for the Pth emulation library.
 
-ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
+ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
 
 # The ordering *is* (sometimes) important.  Some notes on the
 # individual items follow:
@@ -132,186 +137,334 @@ ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt
 # none: in case threads are in libc; should be tried before -Kthread and
 #       other compiler flags to prevent continual compiler warnings
 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
-# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
-# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
-# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
-# -pthreads: Solaris/gcc
-# -mthreads: Mingw32/gcc, Lynx/gcc
+# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
+#           (Note: HP C rejects this with "bad form for `-t' option")
+# -pthreads: Solaris/gcc (Note: HP C also rejects)
 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
-#      doesn't hurt to check since this sometimes defines pthreads too;
-#      also defines -D_REENTRANT)
-#      ... -mt is also the pthreads flag for HP/aCC
+#      doesn't hurt to check since this sometimes defines pthreads and
+#      -D_REENTRANT too), HP C (must be checked before -lpthread, which
+#      is present but should not be used directly; and before -mthreads,
+#      because the compiler interprets this as "-mt" + "-hreads")
+# -mthreads: Mingw32/gcc, Lynx/gcc
 # pthread: Linux, etcetera
 # --thread-safe: KAI C++
 # pthread-config: use pthread-config program (for GNU Pth library)
 
-case ${host_os} in
-        solaris*)
+case $host_os in
+
+	freebsd*)
+
+	# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
+	# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
+
+	ax_pthread_flags="-kthread lthread $ax_pthread_flags"
+	;;
+
+	hpux*)
+
+	# From the cc(1) man page: "[-mt] Sets various -D flags to enable
+	# multi-threading and also sets -lpthread."
+
+	ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
+	;;
+
+	openedition*)
 
-        # On Solaris (at least, for some versions), libc contains stubbed
-        # (non-functional) versions of the pthreads routines, so link-based
-        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
-        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
-        # a function called by this macro, so we could check for that, but
-        # who knows whether they'll stub that too in a future libc.)  So,
-        # we'll just look for -pthreads and -lpthread first:
+	# IBM z/OS requires a feature-test macro to be defined in order to
+	# enable POSIX threads at all, so give the user a hint if this is
+	# not set. (We don't define these ourselves, as they can affect
+	# other portions of the system API in unpredictable ways.)
 
-        ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
-        ;;
+	AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
+	    [
+#	     if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
+	     AX_PTHREAD_ZOS_MISSING
+#	     endif
+	    ],
+	    [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
+	;;
 
-        darwin*)
-        ax_pthread_flags="-pthread $ax_pthread_flags"
-        ;;
+	solaris*)
+
+	# On Solaris (at least, for some versions), libc contains stubbed
+	# (non-functional) versions of the pthreads routines, so link-based
+	# tests will erroneously succeed. (N.B.: The stubs are missing
+	# pthread_cleanup_push, or rather a function called by this macro,
+	# so we could check for that, but who knows whether they'll stub
+	# that too in a future libc.)  So we'll check first for the
+	# standard Solaris way of linking pthreads (-mt -lpthread).
+
+	ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
+	;;
 esac
 
-# Clang doesn't consider unrecognized options an error unless we specify
-# -Werror. We throw in some extra Clang-specific options to ensure that
-# this doesn't happen for GCC, which also accepts -Werror.
-
-AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags])
-save_CFLAGS="$CFLAGS"
-ax_pthread_extra_flags="-Werror"
-CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument"
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])],
-                  [AC_MSG_RESULT([yes])],
-                  [ax_pthread_extra_flags=
-                   AC_MSG_RESULT([no])])
-CFLAGS="$save_CFLAGS"
-
-if test x"$ax_pthread_ok" = xno; then
-for flag in $ax_pthread_flags; do
-
-        case $flag in
-                none)
-                AC_MSG_CHECKING([whether pthreads work without any flags])
-                ;;
-
-                -*)
-                AC_MSG_CHECKING([whether pthreads work with $flag])
-                PTHREAD_CFLAGS="$flag"
-                ;;
-
-                pthread-config)
-                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
-                if test x"$ax_pthread_config" = xno; then continue; fi
-                PTHREAD_CFLAGS="`pthread-config --cflags`"
-                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
-                ;;
-
-                *)
-                AC_MSG_CHECKING([for the pthreads library -l$flag])
-                PTHREAD_LIBS="-l$flag"
-                ;;
-        esac
-
-        save_LIBS="$LIBS"
-        save_CFLAGS="$CFLAGS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags"
-
-        # Check for various functions.  We must include pthread.h,
-        # since some functions may be macros.  (On the Sequent, we
-        # need a special flag -Kthread to make this header compile.)
-        # We check for pthread_join because it is in -lpthread on IRIX
-        # while pthread_create is in libc.  We check for pthread_attr_init
-        # due to DEC craziness with -lpthreads.  We check for
-        # pthread_cleanup_push because it is one of the few pthread
-        # functions on Solaris that doesn't have a non-functional libc stub.
-        # We try pthread_create on general principles.
-        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
-                        static void routine(void *a) { a = 0; }
-                        static void *start_routine(void *a) { return a; }],
-                       [pthread_t th; pthread_attr_t attr;
-                        pthread_create(&th, 0, start_routine, 0);
-                        pthread_join(th, 0);
-                        pthread_attr_init(&attr);
-                        pthread_cleanup_push(routine, 0);
-                        pthread_cleanup_pop(0) /* ; */])],
-                [ax_pthread_ok=yes],
-                [])
-
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
-
-        AC_MSG_RESULT([$ax_pthread_ok])
-        if test "x$ax_pthread_ok" = xyes; then
-                break;
-        fi
-
-        PTHREAD_LIBS=""
-        PTHREAD_CFLAGS=""
+# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
+
+AS_IF([test "x$GCC" = "xyes"],
+      [ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])
+
+# The presence of a feature test macro requesting re-entrant function
+# definitions is, on some systems, a strong hint that pthreads support is
+# correctly enabled
+
+case $host_os in
+	darwin* | hpux* | linux* | osf* | solaris*)
+	ax_pthread_check_macro="_REENTRANT"
+	;;
+
+	aix* | freebsd*)
+	ax_pthread_check_macro="_THREAD_SAFE"
+	;;
+
+	*)
+	ax_pthread_check_macro="--"
+	;;
+esac
+AS_IF([test "x$ax_pthread_check_macro" = "x--"],
+      [ax_pthread_check_cond=0],
+      [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
+
+# Are we compiling with Clang?
+
+AC_CACHE_CHECK([whether $CC is Clang],
+    [ax_cv_PTHREAD_CLANG],
+    [ax_cv_PTHREAD_CLANG=no
+     # Note that Autoconf sets GCC=yes for Clang as well as GCC
+     if test "x$GCC" = "xyes"; then
+	AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
+	    [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
+#	     if defined(__clang__) && defined(__llvm__)
+	     AX_PTHREAD_CC_IS_CLANG
+#	     endif
+	    ],
+	    [ax_cv_PTHREAD_CLANG=yes])
+     fi
+    ])
+ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
+
+ax_pthread_clang_warning=no
+
+# Clang needs special handling, because older versions handle the -pthread
+# option in a rather... idiosyncratic way
+
+if test "x$ax_pthread_clang" = "xyes"; then
+
+	# Clang takes -pthread; it has never supported any other flag
+
+	# (Note 1: This will need to be revisited if a system that Clang
+	# supports has POSIX threads in a separate library.  This tends not
+	# to be the way of modern systems, but it's conceivable.)
+
+	# (Note 2: On some systems, notably Darwin, -pthread is not needed
+	# to get POSIX threads support; the API is always present and
+	# active.  We could reasonably leave PTHREAD_CFLAGS empty.  But
+	# -pthread does define _REENTRANT, and while the Darwin headers
+	# ignore this macro, third-party headers might not.)
+
+	PTHREAD_CFLAGS="-pthread"
+	PTHREAD_LIBS=
+
+	ax_pthread_ok=yes
+
+	# However, older versions of Clang make a point of warning the user
+	# that, in an invocation where only linking and no compilation is
+	# taking place, the -pthread option has no effect ("argument unused
+	# during compilation").  They expect -pthread to be passed in only
+	# when source code is being compiled.
+	#
+	# Problem is, this is at odds with the way Automake and most other
+	# C build frameworks function, which is that the same flags used in
+	# compilation (CFLAGS) are also used in linking.  Many systems
+	# supported by AX_PTHREAD require exactly this for POSIX threads
+	# support, and in fact it is often not straightforward to specify a
+	# flag that is used only in the compilation phase and not in
+	# linking.  Such a scenario is extremely rare in practice.
+	#
+	# Even though use of the -pthread flag in linking would only print
+	# a warning, this can be a nuisance for well-run software projects
+	# that build with -Werror.  So if the active version of Clang has
+	# this misfeature, we search for an option to squash it.
+
+	AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
+	    [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
+	    [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
+	     # Create an alternate version of $ac_link that compiles and
+	     # links in two steps (.c -> .o, .o -> exe) instead of one
+	     # (.c -> exe), because the warning occurs only in the second
+	     # step
+	     ax_pthread_save_ac_link="$ac_link"
+	     ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
+	     ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
+	     ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
+	     ax_pthread_save_CFLAGS="$CFLAGS"
+	     for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
+		AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
+		CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
+		ac_link="$ax_pthread_save_ac_link"
+		AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
+		    [ac_link="$ax_pthread_2step_ac_link"
+		     AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
+			 [break])
+		    ])
+	     done
+	     ac_link="$ax_pthread_save_ac_link"
+	     CFLAGS="$ax_pthread_save_CFLAGS"
+	     AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
+	     ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
+	    ])
+
+	case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
+		no | unknown) ;;
+		*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
+	esac
+
+fi # $ax_pthread_clang = yes
+
+if test "x$ax_pthread_ok" = "xno"; then
+for ax_pthread_try_flag in $ax_pthread_flags; do
+
+	case $ax_pthread_try_flag in
+		none)
+		AC_MSG_CHECKING([whether pthreads work without any flags])
+		;;
+
+		-mt,pthread)
+		AC_MSG_CHECKING([whether pthreads work with -mt -lpthread])
+		PTHREAD_CFLAGS="-mt"
+		PTHREAD_LIBS="-lpthread"
+		;;
+
+		-*)
+		AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
+		PTHREAD_CFLAGS="$ax_pthread_try_flag"
+		;;
+
+		pthread-config)
+		AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
+		AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
+		PTHREAD_CFLAGS="`pthread-config --cflags`"
+		PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
+		;;
+
+		*)
+		AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
+		PTHREAD_LIBS="-l$ax_pthread_try_flag"
+		;;
+	esac
+
+	ax_pthread_save_CFLAGS="$CFLAGS"
+	ax_pthread_save_LIBS="$LIBS"
+	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+	LIBS="$PTHREAD_LIBS $LIBS"
+
+	# Check for various functions.  We must include pthread.h,
+	# since some functions may be macros.  (On the Sequent, we
+	# need a special flag -Kthread to make this header compile.)
+	# We check for pthread_join because it is in -lpthread on IRIX
+	# while pthread_create is in libc.  We check for pthread_attr_init
+	# due to DEC craziness with -lpthreads.  We check for
+	# pthread_cleanup_push because it is one of the few pthread
+	# functions on Solaris that doesn't have a non-functional libc stub.
+	# We try pthread_create on general principles.
+
+	AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
+#			if $ax_pthread_check_cond
+#			 error "$ax_pthread_check_macro must be defined"
+#			endif
+			static void routine(void *a) { a = 0; }
+			static void *start_routine(void *a) { return a; }],
+		       [pthread_t th; pthread_attr_t attr;
+			pthread_create(&th, 0, start_routine, 0);
+			pthread_join(th, 0);
+			pthread_attr_init(&attr);
+			pthread_cleanup_push(routine, 0);
+			pthread_cleanup_pop(0) /* ; */])],
+	    [ax_pthread_ok=yes],
+	    [])
+
+	CFLAGS="$ax_pthread_save_CFLAGS"
+	LIBS="$ax_pthread_save_LIBS"
+
+	AC_MSG_RESULT([$ax_pthread_ok])
+	AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
+
+	PTHREAD_LIBS=""
+	PTHREAD_CFLAGS=""
 done
 fi
 
 # Various other checks:
-if test "x$ax_pthread_ok" = xyes; then
-        save_LIBS="$LIBS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        save_CFLAGS="$CFLAGS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-
-        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
-        AC_MSG_CHECKING([for joinable pthread attribute])
-        attr_name=unknown
-        for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
-            AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
-                           [int attr = $attr; return attr /* ; */])],
-                [attr_name=$attr; break],
-                [])
-        done
-        AC_MSG_RESULT([$attr_name])
-        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
-            AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], [$attr_name],
-                               [Define to necessary symbol if this constant
-                                uses a non-standard name on your system.])
-        fi
-
-        AC_MSG_CHECKING([if more special flags are required for pthreads])
-        flag=no
-        case ${host_os} in
-            aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
-            osf* | hpux*) flag="-D_REENTRANT";;
-            solaris*)
-            if test "$GCC" = "yes"; then
-                flag="-D_REENTRANT"
-            else
-                # TODO: What about Clang on Solaris?
-                flag="-mt -D_REENTRANT"
-            fi
-            ;;
-        esac
-        AC_MSG_RESULT([$flag])
-        if test "x$flag" != xno; then
-            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
-        fi
-
-        AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
-            [ax_cv_PTHREAD_PRIO_INHERIT], [
-                AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
-                                                [[int i = PTHREAD_PRIO_INHERIT;]])],
-                    [ax_cv_PTHREAD_PRIO_INHERIT=yes],
-                    [ax_cv_PTHREAD_PRIO_INHERIT=no])
-            ])
-        AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
-            [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])])
-
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
-
-        # More AIX lossage: compile with *_r variant
-        if test "x$GCC" != xyes; then
-            case $host_os in
-                aix*)
-                AS_CASE(["x/$CC"],
-                  [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
-                  [#handle absolute path differently from PATH based program lookup
-                   AS_CASE(["x$CC"],
-                     [x/*],
-                     [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
-                     [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
-                ;;
-            esac
-        fi
+if test "x$ax_pthread_ok" = "xyes"; then
+	ax_pthread_save_CFLAGS="$CFLAGS"
+	ax_pthread_save_LIBS="$LIBS"
+	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+	LIBS="$PTHREAD_LIBS $LIBS"
+
+	# Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
+	AC_CACHE_CHECK([for joinable pthread attribute],
+	    [ax_cv_PTHREAD_JOINABLE_ATTR],
+	    [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
+	     for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
+		 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
+						 [int attr = $ax_pthread_attr; return attr /* ; */])],
+				[ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
+				[])
+	     done
+	    ])
+	AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
+	       test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
+	       test "x$ax_pthread_joinable_attr_defined" != "xyes"],
+	      [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
+				  [$ax_cv_PTHREAD_JOINABLE_ATTR],
+				  [Define to necessary symbol if this constant
+				   uses a non-standard name on your system.])
+	       ax_pthread_joinable_attr_defined=yes
+	      ])
+
+	AC_CACHE_CHECK([whether more special flags are required for pthreads],
+	    [ax_cv_PTHREAD_SPECIAL_FLAGS],
+	    [ax_cv_PTHREAD_SPECIAL_FLAGS=no
+	     case $host_os in
+	     solaris*)
+	     ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
+	     ;;
+	     esac
+	    ])
+	AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
+	       test "x$ax_pthread_special_flags_added" != "xyes"],
+	      [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
+	       ax_pthread_special_flags_added=yes])
+
+	AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
+	    [ax_cv_PTHREAD_PRIO_INHERIT],
+	    [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
+					     [[int i = PTHREAD_PRIO_INHERIT;]])],
+			    [ax_cv_PTHREAD_PRIO_INHERIT=yes],
+			    [ax_cv_PTHREAD_PRIO_INHERIT=no])
+	    ])
+	AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
+	       test "x$ax_pthread_prio_inherit_defined" != "xyes"],
+	      [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
+	       ax_pthread_prio_inherit_defined=yes
+	      ])
+
+	CFLAGS="$ax_pthread_save_CFLAGS"
+	LIBS="$ax_pthread_save_LIBS"
+
+	# More AIX lossage: compile with *_r variant
+	if test "x$GCC" != "xyes"; then
+	    case $host_os in
+		aix*)
+		AS_CASE(["x/$CC"],
+		    [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
+		    [#handle absolute path differently from PATH based program lookup
+		     AS_CASE(["x$CC"],
+			 [x/*],
+			 [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
+			 [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
+		;;
+	    esac
+	fi
 fi
 
 test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
@@ -321,12 +474,12 @@ AC_SUBST([PTHREAD_CFLAGS])
 AC_SUBST([PTHREAD_CC])
 
 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
-if test x"$ax_pthread_ok" = xyes; then
-        ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
-        :
+if test "x$ax_pthread_ok" = "xyes"; then
+	ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
+	:
 else
-        ax_pthread_ok=no
-        $2
+	ax_pthread_ok=no
+	$2
 fi
 AC_LANG_POP
 ])dnl AX_PTHREAD
diff --git a/build-aux/m4/l_atomic.m4 b/build-aux/m4/l_atomic.m4
new file mode 100644
index 000000000..906724b64
--- /dev/null
+++ b/build-aux/m4/l_atomic.m4
@@ -0,0 +1,40 @@
+# Some versions of gcc/libstdc++ require linking with -latomic if
+# using the C++ atomic library.
+#
+# Sourced from http://bugs.debian.org/797228
+
+m4_define([_CHECK_ATOMIC_testbody], [[
+  #include <atomic>
+  #include <cstdint>
+
+  int main() {
+    std::atomic<int64_t> a{};
+
+    int64_t v = 5;
+    int64_t r = a.fetch_add(v);
+    return static_cast<int>(r);
+  }
+]])
+
+AC_DEFUN([CHECK_ATOMIC], [
+
+  AC_LANG_PUSH(C++)
+
+  AC_MSG_CHECKING([whether std::atomic can be used without link library])
+
+  AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_ATOMIC_testbody])],[
+      AC_MSG_RESULT([yes])
+    ],[
+      AC_MSG_RESULT([no])
+      LIBS="$LIBS -latomic"
+      AC_MSG_CHECKING([whether std::atomic needs -latomic])
+      AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_ATOMIC_testbody])],[
+          AC_MSG_RESULT([yes])
+        ],[
+          AC_MSG_RESULT([no])
+          AC_MSG_FAILURE([cannot figure our how to use std::atomic])
+        ])
+    ])
+
+  AC_LANG_POP
+])
diff --git a/configure.ac b/configure.ac
index 03038d7dd..97c45cd7e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@ dnl require autoconf 2.60 (AS_ECHO/AS_ECHO_N)
 AC_PREREQ([2.60])
 define(_CLIENT_VERSION_MAJOR, 1)
 define(_CLIENT_VERSION_MINOR, 0)
-define(_CLIENT_VERSION_REVISION, 13)
+define(_CLIENT_VERSION_REVISION, 14)
 define(_CLIENT_VERSION_BUILD, 50)
 define(_ZC_BUILD_VAL, m4_if(m4_eval(_CLIENT_VERSION_BUILD < 25), 1, m4_incr(_CLIENT_VERSION_BUILD), m4_eval(_CLIENT_VERSION_BUILD < 50), 1, m4_eval(_CLIENT_VERSION_BUILD - 24), m4_eval(_CLIENT_VERSION_BUILD == 50), 1, , m4_eval(_CLIENT_VERSION_BUILD - 50)))
 define(_CLIENT_VERSION_SUFFIX, m4_if(m4_eval(_CLIENT_VERSION_BUILD < 25), 1, _CLIENT_VERSION_REVISION-beta$1, m4_eval(_CLIENT_VERSION_BUILD < 50), 1, _CLIENT_VERSION_REVISION-rc$1, m4_eval(_CLIENT_VERSION_BUILD == 50), 1, _CLIENT_VERSION_REVISION, _CLIENT_VERSION_REVISION-$1)))
@@ -15,6 +15,16 @@ AC_CONFIG_HEADERS([src/config/bitcoin-config.h])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([build-aux/m4])
 
+BITCOIN_DAEMON_NAME=hushd
+BITCOIN_CLI_NAME=hush-cli
+BITCOIN_TX_NAME=hush-tx
+
+dnl Unless the user specified ARFLAGS, force it to be cr
+AC_ARG_VAR(ARFLAGS, [Flags for the archiver, defaults to <cr> if not set])
+if test "x${ARFLAGS+set}" != "xset"; then
+  ARFLAGS="cr"
+fi
+
 AC_CANONICAL_HOST
 
 AH_TOP([#ifndef BITCOIN_CONFIG_H])
@@ -41,10 +51,6 @@ else
   CXXFLAGS_overridden=no
 fi
 
-# Hush requries C++11 compatibility; set it early:
-
-CXXFLAGS="-std=c++11 $CXXFLAGS"
-
 AC_PROG_CXX
 m4_ifdef([AC_PROG_OBJCXX],[AC_PROG_OBJCXX])
 
@@ -56,6 +62,11 @@ case $host in
      lt_cv_deplibs_check_method="pass_all"
   ;;
 esac
+dnl Require C++11 compiler (no GNU extensions)
+AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory], [nodefault])
+dnl Check if -latomic is required for <std::atomic>
+CHECK_ATOMIC
+
 dnl Libtool init checks.
 LT_INIT([pic-only])
 
@@ -65,7 +76,6 @@ AC_PATH_TOOL(RANLIB, ranlib)
 AC_PATH_TOOL(STRIP, strip)
 AC_PATH_TOOL(GCOV, gcov)
 AC_PATH_PROG(LCOV, lcov)
-AC_PATH_PROG(JAVA, java)
 AC_PATH_PROG(GENHTML, genhtml)
 AC_PATH_PROG([GIT], [git])
 AC_PATH_PROG(CCACHE,ccache)
@@ -74,9 +84,6 @@ AC_PATH_PROG(HEXDUMP,hexdump)
 AC_PATH_TOOL(READELF,readelf)
 AC_PATH_TOOL(CPPFILT,c++filt)
 
-dnl pkg-config check.
-PKG_PROG_PKG_CONFIG
-
 # Enable wallet
 AC_ARG_ENABLE([wallet],
   [AS_HELP_STRING([--enable-wallet],
@@ -107,16 +114,6 @@ AC_ARG_ENABLE(tests,
     [use_tests=$enableval],
     [use_tests=yes])
 
-AC_ARG_WITH([comparison-tool],
-    AS_HELP_STRING([--with-comparison-tool],[path to java comparison tool (requires --enable-tests)]),
-    [use_comparison_tool=$withval],
-    [use_comparison_tool=no])
-
-AC_ARG_ENABLE([comparison-tool-reorg-tests],
-    AS_HELP_STRING([--enable-comparison-tool-reorg-tests],[enable expensive reorg tests in the comparison tool (default no)]),
-    [use_comparison_tool_reorg_tests=$enableval],
-    [use_comparison_tool_reorg_tests=no])
-
 AC_ARG_ENABLE([hardening],
   [AS_HELP_STRING([--enable-hardening],
   [attempt to harden the resulting executables (default is yes)])],
@@ -168,6 +165,16 @@ AC_ARG_ENABLE([debug],
     [enable_debug=$enableval],
     [enable_debug=no])
 
+# Turn warnings into errors
+AC_ARG_ENABLE([werror],
+    [AS_HELP_STRING([--enable-werror],
+                    [Treat all compiler warnings as errors (default is no)])],
+    [enable_werror=$enableval],
+    [enable_werror=no])
+
+AC_LANG_PUSH([C++])
+AX_CHECK_COMPILE_FLAG([-Werror],[CXXFLAG_WERROR="-Werror"],[CXXFLAG_WERROR=""])
+
 if test "x$enable_debug" = xyes; then
     CPPFLAGS="$CPPFLAGS -DDEBUG -DDEBUG_LOCKORDER"
     if test "x$GCC" = xyes; then
@@ -179,11 +186,28 @@ if test "x$enable_debug" = xyes; then
     fi
 fi
 
-## TODO: Remove these hard-coded paths and flags. They are here for the sake of
-##       compatibility with the legacy buildsystem.
-##
+ERROR_CXXFLAGS=
+if test "x$enable_werror" = "xyes"; then
+  if test "x$CXXFLAG_WERROR" = "x"; then
+    AC_MSG_ERROR("enable-werror set but -Werror is not usable")
+  fi
+  ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror"
+fi
+
 if test "x$CXXFLAGS_overridden" = "xno"; then
-  CXXFLAGS="$CXXFLAGS -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter -Wno-self-assign"
+  AX_CHECK_COMPILE_FLAG([-Wall],[CXXFLAGS="$CXXFLAGS -Wall"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wextra],[CXXFLAGS="$CXXFLAGS -Wextra"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wformat],[CXXFLAGS="$CXXFLAGS -Wformat"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wvla],[CXXFLAGS="$CXXFLAGS -Wvla"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wformat-security],[CXXFLAGS="$CXXFLAGS -Wformat-security"],,[[$CXXFLAG_WERROR]])
+
+  ## Some compilers (gcc) ignore unknown -Wno-* options, but warn about all
+  ## unknown options if any other warning is produced. Test the -Wfoo case, and
+  ## set the -Wno-foo case if it works.
+  AX_CHECK_COMPILE_FLAG([-Wunused-parameter],[CXXFLAGS="$CXXFLAGS -Wno-unused-parameter"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wself-assign],[CXXFLAGS="$CXXFLAGS -Wno-self-assign"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wunused-local-typedef],[CXXFLAGS="$CXXFLAGS -Wno-unused-local-typedef"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wdeprecated-register],[CXXFLAGS="$CXXFLAGS -Wno-deprecated-register"],,[[$CXXFLAG_WERROR]])
 fi
 CPPFLAGS="$CPPFLAGS -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS"
 
@@ -205,8 +229,6 @@ AC_ARG_WITH([daemon],
   [build_bitcoind=$withval],
   [build_bitcoind=yes])
 
-AC_LANG_PUSH([C++])
-
 use_pkgconfig=yes
 case $host in
   *mingw*)
@@ -326,6 +348,7 @@ case $host in
 
      AX_CHECK_LINK_FLAG([[-Wl,-headerpad_max_install_names]], [LDFLAGS="$LDFLAGS -Wl,-headerpad_max_install_names"])
      CPPFLAGS="$CPPFLAGS -DMAC_OSX"
+     OBJCXXFLAGS="$CXXFLAGS"
      ;;
    *linux*)
      TARGET_OS=linux
@@ -334,20 +357,14 @@ case $host in
      ;;
 esac
 
-if test x$use_comparison_tool != xno; then
-  if test x$JAVA = x; then
-    AC_MSG_ERROR("comparison tool set but java not found")
-  fi
-  AC_SUBST(JAVA_COMPARISON_TOOL, $use_comparison_tool)
-fi
-
-if test x$use_comparison_tool_reorg_tests != xno; then
-  if test x$use_comparison_tool = x; then
-    AC_MSG_ERROR("comparison tool reorg tests but comparison tool was not specified")
+if test x$use_pkgconfig = xyes; then
+  m4_ifndef([PKG_PROG_PKG_CONFIG], [AC_MSG_ERROR(PKG_PROG_PKG_CONFIG macro not found. Please install pkg-config and re-run autogen.sh.)])
+  m4_ifdef([PKG_PROG_PKG_CONFIG], [
+  PKG_PROG_PKG_CONFIG
+  if test x"$PKG_CONFIG" = "x"; then
+    AC_MSG_ERROR(pkg-config not found.)
   fi
-  AC_SUBST(COMPARISON_TOOL_REORG_TESTS, 1)
-else
-  AC_SUBST(COMPARISON_TOOL_REORG_TESTS, 0)
+  ])
 fi
 
 if test x$use_lcov = xyes; then
@@ -357,15 +374,9 @@ if test x$use_lcov = xyes; then
   if test x$GCOV = x; then
     AC_MSG_ERROR("lcov testing requested but gcov not found")
   fi
-  if test x$JAVA = x; then
-    AC_MSG_ERROR("lcov testing requested but java not found")
-  fi
   if test x$GENHTML = x; then
     AC_MSG_ERROR("lcov testing requested but genhtml not found")
   fi
-  if test x$use_comparison_tool = x; then
-    AC_MSG_ERROR("lcov testing requested but comparison tool was not specified")
-  fi
   LCOV="$LCOV --gcov-tool=$GCOV --rc lcov_branch_coverage=1"
   GENHTML="$GENHTML --branch-coverage"
   AX_CHECK_COMPILE_FLAG([--coverage],[CXXFLAGS="$CXXFLAGS --coverage"],
@@ -426,6 +437,11 @@ else
   AC_SEARCH_LIBS([clock_gettime],[rt])
 fi
 
+if test x$TARGET_OS != xwindows; then
+  # All windows code is PIC, forcing it on just adds useless compile warnings
+  AX_CHECK_COMPILE_FLAG([-fPIC],[PIC_FLAGS="-fPIC"])
+fi
+
 if test x$use_hardening != xno; then
   AX_CHECK_COMPILE_FLAG([-Wformat],[HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -Wformat"],[AC_MSG_ERROR(Cannot enable -Wformat)])
   AX_CHECK_COMPILE_FLAG([-Wformat-security],[HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -Wformat-security"],[AC_MSG_ERROR(Cannot enable -Wformat-security)],[-Wformat])
@@ -444,12 +460,13 @@ if test x$use_hardening != xno; then
     AX_CHECK_LINK_FLAG([[-Wl,-z,now]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,now"],[AC_MSG_ERROR(Cannot enable BIND_NOW)])
 
     # All windows code is PIC, forcing it on just adds useless compile warnings
-    AX_CHECK_COMPILE_FLAG([-fPIE],[HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -fPIE"],[AC_MSG_ERROR(Cannot enable -fPIE)])
+    AX_CHECK_COMPILE_FLAG([-fPIE],[PIE_FLAGS="-fPIE"],[AC_MSG_ERROR(Cannot enable -fPIE)])
     AX_CHECK_LINK_FLAG([[-pie]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -pie"],[AC_MSG_ERROR(Cannot enable -pie)])
   else
     # These are only available on Windows.
     AX_CHECK_LINK_FLAG([[-Wl,--dynamicbase]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--dynamicbase"],[AC_MSG_ERROR(Cannot enable --dynamicbase)])
     AX_CHECK_LINK_FLAG([[-Wl,--nxcompat]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--nxcompat"],[AC_MSG_ERROR(Cannot enable --nxcompat)])
+    AX_CHECK_LINK_FLAG([[-Wl,--high-entropy-va]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--high-entropy-va"],[AC_MSG_ERROR(Cannot enable ASLR)])
   fi
 
   case $host in
@@ -457,11 +474,6 @@ if test x$use_hardening != xno; then
        AC_CHECK_LIB([ssp],      [main],, AC_MSG_ERROR(lib missing))
     ;;
   esac
-
-  CXXFLAGS="$CXXFLAGS $HARDENED_CXXFLAGS"
-  CPPFLAGS="$CPPFLAGS $HARDENED_CPPFLAGS"
-  LDFLAGS="$LDFLAGS $HARDENED_LDFLAGS"
-  OBJCXXFLAGS="$CXXFLAGS"
 fi
 
 dnl this flag screws up non-darwin gcc even when the check fails. special-case it.
@@ -556,33 +568,14 @@ fi
 if test x$use_boost = xyes; then
 
 dnl Check for boost libs
-AX_BOOST_BASE
+dnl We need Boost >= 1.62 to fix a potential security bug (https://github.com/zcash/zcash/issues/1241)
+AX_BOOST_BASE([1.62])
 AX_BOOST_SYSTEM
 AX_BOOST_FILESYSTEM
 AX_BOOST_PROGRAM_OPTIONS
 AX_BOOST_THREAD
 AX_BOOST_CHRONO
 
-
-if test x$use_reduce_exports = xyes; then
-  AC_MSG_CHECKING([for working boost reduced exports])
-  TEMP_CPPFLAGS="$CPPFLAGS"
-  CPPFLAGS="$BOOST_CPPFLAGS $CPPFLAGS"
-  AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
-      @%:@include <boost/version.hpp>
-    ]], [[
-      #if BOOST_VERSION >= 104900
-      // Everything is okay
-      #else
-      #  error Boost version is too old
-      #endif
-    ]])],[
-      AC_MSG_RESULT(yes)
-    ],[
-    AC_MSG_ERROR([boost versions < 1.49 are known to be broken with reduced exports. Use --disable-reduce-exports.])
-  ])
-  CPPFLAGS="$TEMP_CPPFLAGS"
-fi
 fi
 
 if test x$use_reduce_exports = xyes; then
@@ -623,69 +616,11 @@ if test x$use_tests = xyes; then
 fi
 
 if test x$use_boost = xyes; then
-
 BOOST_LIBS="$BOOST_LDFLAGS $BOOST_SYSTEM_LIB $BOOST_FILESYSTEM_LIB $BOOST_PROGRAM_OPTIONS_LIB $BOOST_THREAD_LIB $BOOST_CHRONO_LIB"
-
-dnl Boost >= 1.50 uses sleep_for rather than the now-deprecated sleep, however
-dnl it was broken from 1.50 to 1.52 when backed by nanosleep. Use sleep_for if
-dnl a working version is available, else fall back to sleep. sleep was removed
-dnl after 1.56.
-dnl If neither is available, abort.
-TEMP_LIBS="$LIBS"
-LIBS="$BOOST_LIBS $LIBS"
-TEMP_CPPFLAGS="$CPPFLAGS"
-CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[
-  #include <boost/thread/thread.hpp>
-  #include <boost/version.hpp>
-  ]],[[
-  #if BOOST_VERSION >= 105000 && (!defined(BOOST_HAS_NANOSLEEP) || BOOST_VERSION >= 105200)
-      boost::this_thread::sleep_for(boost::chrono::milliseconds(0));
-  #else
-   choke me
-  #endif
-  ]])],
-  [boost_sleep=yes;
-     AC_DEFINE(HAVE_WORKING_BOOST_SLEEP_FOR, 1, [Define this symbol if boost sleep_for works])],
-  [boost_sleep=no])
-LIBS="$TEMP_LIBS"
-CPPFLAGS="$TEMP_CPPFLAGS"
-
-if test x$boost_sleep != xyes; then
-TEMP_LIBS="$LIBS"
-LIBS="$BOOST_LIBS $LIBS"
-TEMP_CPPFLAGS="$CPPFLAGS"
-CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[
-  #include <boost/version.hpp>
-  #include <boost/thread.hpp>
-  #include <boost/date_time/posix_time/posix_time_types.hpp>
-  ]],[[
-  #if BOOST_VERSION <= 105600
-      boost::this_thread::sleep(boost::posix_time::milliseconds(0));
-  #else
-   choke me
-  #endif
-  ]])],
-  [boost_sleep=yes; AC_DEFINE(HAVE_WORKING_BOOST_SLEEP, 1, [Define this symbol if boost sleep works])],
-  [boost_sleep=no])
-LIBS="$TEMP_LIBS"
-CPPFLAGS="$TEMP_CPPFLAGS"
-fi
-
-if test x$boost_sleep != xyes; then
-  AC_MSG_ERROR(No working boost sleep implementation found.)
-fi
-
 fi
 
 if test x$use_pkgconfig = xyes; then
-
-  if test x"$PKG_CONFIG" = "x"; then
-    AC_MSG_ERROR(pkg-config not found.)
-  fi
-
-  : #NOP
+  : dnl
   m4_ifdef(
     [PKG_CHECK_MODULES],
     [
@@ -764,6 +699,15 @@ if test x$enable_rust != xno; then
   RUST_LIBS="-lrustzcash"
 fi
 
+dnl Check for OpenMP support
+AX_OPENMP(
+  [AC_DEFINE(HAVE_OPENMP, 1, [Define if OpenMP is enabled])
+   AM_CONDITIONAL([HAVE_OPENMP], [true])
+   CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS"],
+  [AC_MSG_WARN([OpenMP not supported, disabling multithreading])
+   AC_DEFINE(HAVE_OPENMP, 0, [Define if OpenMP is enabled])
+   AM_CONDITIONAL([HAVE_OPENMP], [false])])
+
 # Gitian uses a config.site that sets depends_prefix, and then sets --prefix=/
 # build.sh just uses --prefix
 if test x$depends_prefix != x; then
@@ -772,15 +716,12 @@ else
   LIBSNARK_DEPINST="$prefix"
 fi
 
-LIBZCASH_LIBS="-lgmp -lgmpxx -lboost_system-mt -lcrypto -lsodium -fopenmp $RUST_LIBS"
+# Additional Zcash flags
+AX_CHECK_COMPILE_FLAG([-fwrapv],[CXXFLAGS="$CXXFLAGS -fwrapv"])
+AX_CHECK_COMPILE_FLAG([-fno-strict-aliasing],[CXXFLAGS="$CXXFLAGS -fno-strict-aliasing"])
+AX_CHECK_COMPILE_FLAG([-Wno-builtin-declaration-mismatch],[CXXFLAGS="$CXXFLAGS -Wno-builtin-declaration-mismatch"],,[[$CXXFLAG_WERROR]])
 
-CXXFLAGS_TEMP="$CXXFLAGS"
-LIBS_TEMP="$LIBS"
-CXXFLAGS="$CXXFLAGS $SSL_CFLAGS $CRYPTO_CFLAGS"
-LIBS="$LIBS $SSL_LIBS $CRYPTO_LIBS $GMP_LIBS $GMPXX_LIBS"
-AC_CHECK_HEADER([openssl/ec.h],, AC_MSG_ERROR(OpenSSL ec header missing),)
-CXXFLAGS="$CXXFLAGS_TEMP"
-LIBS="$LIBS_TEMP"
+LIBZCASH_LIBS="-lgmp -lgmpxx -lboost_system-mt -lcrypto -lsodium $RUST_LIBS"
 
 AC_MSG_CHECKING([whether to build bitcoind])
 AM_CONDITIONAL([BUILD_BITCOIND], [test x$build_bitcoind = xyes])
@@ -882,8 +823,6 @@ AM_CONDITIONAL([ENABLE_MINING],[test x$enable_mining = xyes])
 AM_CONDITIONAL([ENABLE_RUST],[test x$enable_rust = xyes])
 AM_CONDITIONAL([ENABLE_TESTS],[test x$BUILD_TEST = xyes])
 AM_CONDITIONAL([USE_LCOV],[test x$use_lcov = xyes])
-AM_CONDITIONAL([USE_COMPARISON_TOOL],[test x$use_comparison_tool != xno])
-AM_CONDITIONAL([USE_COMPARISON_TOOL_REORG_TESTS],[test x$use_comparison_tool_reorg_test != xno])
 AM_CONDITIONAL([GLIBC_BACK_COMPAT],[test x$use_glibc_compat = xyes])
 AM_CONDITIONAL([HARDEN],[test x$use_hardening = xyes])
 
@@ -899,12 +838,26 @@ AC_SUBST(CLIENT_VERSION_REVISION, _CLIENT_VERSION_REVISION)
 AC_SUBST(CLIENT_VERSION_BUILD, _CLIENT_VERSION_BUILD)
 AC_SUBST(CLIENT_VERSION_IS_RELEASE, _CLIENT_VERSION_IS_RELEASE)
 AC_SUBST(COPYRIGHT_YEAR, _COPYRIGHT_YEAR)
+AC_SUBST(BITCOIN_DAEMON_NAME)
+AC_SUBST(BITCOIN_CLI_NAME)
+AC_SUBST(BITCOIN_TX_NAME)
 
 AC_SUBST(RELDFLAGS)
+AC_SUBST(ERROR_CXXFLAGS)
+AC_SUBST(HARDENED_CXXFLAGS)
+AC_SUBST(HARDENED_CPPFLAGS)
+AC_SUBST(HARDENED_LDFLAGS)
+AC_SUBST(PIC_FLAGS)
+AC_SUBST(PIE_FLAGS)
 AC_SUBST(LIBTOOL_APP_LDFLAGS)
 AC_SUBST(BOOST_LIBS)
 AC_SUBST(TESTDEFS)
 AC_SUBST(LEVELDB_TARGET_FLAGS)
+AC_SUBST(CRYPTO_LIBS)
+AC_SUBST(SSL_LIBS)
+AC_SUBST(EVENT_LIBS)
+AC_SUBST(EVENT_PTHREADS_LIBS)
+AC_SUBST(ZMQ_LIBS)
 AC_SUBST(GMP_LIBS)
 AC_SUBST(GMPXX_LIBS)
 AC_SUBST(LIBSNARK_DEPINST)
@@ -952,3 +905,25 @@ case $host in
      chmod 755 libtool
    ;;
 esac
+
+echo 
+echo "Options used to compile and link:"
+echo "  with wallet   = $enable_wallet"
+echo "  with rust     = $enable_rust"
+echo "  with proton   = $use_proton"
+echo "  with zmq      = $use_zmq"
+echo "  with test     = $use_tests"
+echo "  debug enabled = $enable_debug"
+echo "  werror        = $enable_werror"
+echo 
+echo "  target os     = $TARGET_OS"
+echo "  build os      = $BUILD_OS"
+echo
+echo "  CC            = $CC"
+echo "  CFLAGS        = $CFLAGS"
+echo "  CPPFLAGS      = $CPPFLAGS"
+echo "  CXX           = $CXX"
+echo "  CXXFLAGS      = $CXXFLAGS"
+echo "  LDFLAGS       = $LDFLAGS"
+echo "  ARFLAGS       = $ARFLAGS"
+echo 
diff --git a/contrib/gitian-descriptors/gitian-linux.yml b/contrib/gitian-descriptors/gitian-linux.yml
index 7d66694be..5cf20b099 100644
--- a/contrib/gitian-descriptors/gitian-linux.yml
+++ b/contrib/gitian-descriptors/gitian-linux.yml
@@ -1,5 +1,5 @@
 ---
-name: "hush-1.0.13"
+name: "hush-1.0.14"
 enable_cache: true
 distro: "debian"
 suites:
diff --git a/depends/builders/darwin.mk b/depends/builders/darwin.mk
index af60fa8ea..ba325263f 100644
--- a/depends/builders/darwin.mk
+++ b/depends/builders/darwin.mk
@@ -7,7 +7,7 @@ build_darwin_OTOOL: = $(shell xcrun -f otool)
 build_darwin_NM: = $(shell xcrun -f nm)
 build_darwin_INSTALL_NAME_TOOL:=$(shell xcrun -f install_name_tool)
 build_darwin_SHA256SUM = shasum -a 256
-build_darwin_DOWNLOAD = wget --timeout=$(DOWNLOAD_CONNECT_TIMEOUT) --tries=$(DOWNLOAD_RETRIES) -nv -O
+build_darwin_DOWNLOAD = curl --location --fail --connect-timeout $(DOWNLOAD_CONNECT_TIMEOUT) --retry $(DOWNLOAD_RETRIES) -o
 
 #darwin host on darwin builder. overrides darwin host preferences.
 darwin_CC= gcc-5
diff --git a/depends/builders/linux.mk b/depends/builders/linux.mk
index 98d0e9de3..b03f42401 100644
--- a/depends/builders/linux.mk
+++ b/depends/builders/linux.mk
@@ -1,2 +1,2 @@
 build_linux_SHA256SUM = sha256sum
-build_linux_DOWNLOAD = wget --timeout=$(DOWNLOAD_CONNECT_TIMEOUT) --tries=$(DOWNLOAD_RETRIES) -nv -O
+build_linux_DOWNLOAD = curl --location --fail --connect-timeout $(DOWNLOAD_CONNECT_TIMEOUT) --retry $(DOWNLOAD_RETRIES) -o
diff --git a/depends/config.site.in b/depends/config.site.in
index 103486332..8cdbcd2e4 100644
--- a/depends/config.site.in
+++ b/depends/config.site.in
@@ -7,10 +7,6 @@ ac_tool_prefix=${host_alias}-
 if test -z $with_boost; then
   with_boost=$depends_prefix
 fi
-# Disable comparison utility (#592)
-#if test -z $with_comparison_tool; then
-#  with_comparison_tool=$depends_prefix/native/share/BitcoindComparisonTool_jar/BitcoindComparisonTool.jar
-#fi
 
 
 if test -z $enable_wallet && test -n "@no_wallet@"; then
diff --git a/depends/funcs.mk b/depends/funcs.mk
index e1aeb026a..df305a74a 100644
--- a/depends/funcs.mk
+++ b/depends/funcs.mk
@@ -129,9 +129,9 @@ $(1)_config_env+=$($(1)_config_env_$(host_arch)_$(host_os)) $($(1)_config_env_$(
 
 $(1)_config_env+=PKG_CONFIG_LIBDIR=$($($(1)_type)_prefix)/lib/pkgconfig
 $(1)_config_env+=PKG_CONFIG_PATH=$($($(1)_type)_prefix)/share/pkgconfig
-$(1)_config_env+=PATH=$(build_prefix)/bin:$(PATH)
-$(1)_build_env+=PATH=$(build_prefix)/bin:$(PATH)
-$(1)_stage_env+=PATH=$(build_prefix)/bin:$(PATH)
+$(1)_config_env+=PATH="$(build_prefix)/bin:$(PATH)"
+$(1)_build_env+=PATH="$(build_prefix)/bin:$(PATH)"
+$(1)_stage_env+=PATH="$(build_prefix)/bin:$(PATH)"
 $(1)_autoconf=./configure --host=$($($(1)_type)_host) --disable-dependency-tracking --prefix=$($($(1)_type)_prefix) $$($(1)_config_opts) CC="$$($(1)_cc)" CXX="$$($(1)_cxx)"
 
 ifneq ($($(1)_nm),)
diff --git a/depends/hosts/darwin.mk b/depends/hosts/darwin.mk
index 2958dc50c..4e58bec74 100644
--- a/depends/hosts/darwin.mk
+++ b/depends/hosts/darwin.mk
@@ -1,9 +1,9 @@
-OSX_MIN_VERSION=10.7
-OSX_SDK_VERSION=10.9
+OSX_MIN_VERSION=10.8
+OSX_SDK_VERSION=10.11
 OSX_SDK=$(SDK_PATH)/MacOSX$(OSX_SDK_VERSION).sdk
-LD64_VERSION=241.9
+LD64_VERSION=253.9
 darwin_CC=clang -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK) -mlinker-version=$(LD64_VERSION)
-darwin_CXX=clang++ -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK) -mlinker-version=$(LD64_VERSION)
+darwin_CXX=clang++ -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK) -mlinker-version=$(LD64_VERSION) -stdlib=libc++
 
 darwin_CFLAGS=-pipe
 darwin_CXXFLAGS=$(darwin_CFLAGS)
diff --git a/depends/hosts/linux.mk b/depends/hosts/linux.mk
index 0d6dc6821..31748d662 100644
--- a/depends/hosts/linux.mk
+++ b/depends/hosts/linux.mk
@@ -1,4 +1,4 @@
-linux_CFLAGS=-pipe -fPIC
+linux_CFLAGS=-pipe
 linux_CXXFLAGS=$(linux_CFLAGS)
 
 linux_release_CFLAGS=-O1
diff --git a/depends/packages/bdb.mk b/depends/packages/bdb.mk
index 36e60d2ae..6993b5086 100644
--- a/depends/packages/bdb.mk
+++ b/depends/packages/bdb.mk
@@ -9,6 +9,12 @@ define $(package)_set_vars
 $(package)_config_opts=--disable-shared --enable-cxx --disable-replication
 $(package)_config_opts_mingw32=--enable-mingw
 $(package)_config_opts_linux=--with-pic
+$(package)_cxxflags=-std=c++11
+endef
+
+define $(package)_preprocess_cmds
+  sed -i.old 's/__atomic_compare_exchange\\(/__atomic_compare_exchange_db(/' src/dbinc/atomic.h && \
+  sed -i.old 's/atomic_init/atomic_init_db/' src/dbinc/atomic.h src/mp/mp_region.c src/mp/mp_mvcc.c src/mp/mp_fget.c src/mutex/mut_method.c src/mutex/mut_tas.c
 endef
 
 define $(package)_config_cmds
diff --git a/depends/packages/boost.mk b/depends/packages/boost.mk
index a2e820163..9f8f50a40 100644
--- a/depends/packages/boost.mk
+++ b/depends/packages/boost.mk
@@ -19,8 +19,9 @@ $(package)_config_opts_i686_linux=address-model=32 architecture=x86
 $(package)_toolset_$(host_os)=gcc
 $(package)_archiver_$(host_os)=$($(package)_ar)
 $(package)_toolset_darwin=gcc
+$(package)_archiver_darwin=$($(package)_libtool)
 $(package)_config_libraries=chrono,filesystem,program_options,system,thread,test
-$(package)_cxxflags=-fvisibility=hidden
+$(package)_cxxflags=-std=c++11 -fvisibility=hidden
 $(package)_cxxflags_linux=-fPIC
 endef
 
diff --git a/depends/packages/googlemock.mk b/depends/packages/googlemock.mk
index 5dd875675..8d7954b9b 100644
--- a/depends/packages/googlemock.mk
+++ b/depends/packages/googlemock.mk
@@ -9,8 +9,8 @@ $(package)_file_name=$(package)-$($(package)_version).tar.gz
 $(package)_download_file=release-$($(package)_version).tar.gz
 $(package)_sha256_hash=3f20b6acb37e5a98e8c4518165711e3e35d47deb6cdb5a4dd4566563b5efd232
 
-define $(package)_set_vars
-    $(package)_build_env=AR="$($(package)_ar)" RANLIB="$($(package)_ranlib)" CC="$($(package)_cc)" CXX="$($(package)_cxx)" CXXFLAGS="$($(package)_cxxflags)"
+define $(package)_build_cmds
+  $(MAKE) -C make GTEST_DIR='$(host_prefix)' CXXFLAGS='-fPIC' gmock-all.o
 endef
 
 BUILD_OS := $(shell uname)
@@ -20,11 +20,7 @@ else
     $(package)_install=install
 endif
 
-define $(package)_build_cmds
-    $(MAKE) -C make GTEST_DIR='$(host_prefix)' gmock-all.o
-endef
-
 define $(package)_stage_cmds
-    $($(package)_install) -D ./make/gmock-all.o $($(package)_staging_dir)$(host_prefix)/lib/libgmock.a && \
-    cp -a ./include $($(package)_staging_dir)$(host_prefix)/include
-endef
\ No newline at end of file
+  install -D ./make/gmock-all.o $($(package)_staging_dir)$(host_prefix)/lib/libgmock.a && \
+  cp -a ./include $($(package)_staging_dir)$(host_prefix)/include
+endef
diff --git a/depends/packages/googletest.mk b/depends/packages/googletest.mk
index 666796584..35ef24830 100644
--- a/depends/packages/googletest.mk
+++ b/depends/packages/googletest.mk
@@ -1,13 +1,9 @@
 package=googletest
-$(package)_version=1.7.0
+$(package)_version=1.8.0
 $(package)_download_path=https://github.com/google/$(package)/archive/
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
 $(package)_download_file=release-$($(package)_version).tar.gz
-$(package)_sha256_hash=f73a6546fdf9fce9ff93a5015e0333a8af3062a152a9ad6bcb772c96687016cc
-
-define $(package)_set_vars
-    $(package)_build_env=AR="$($(package)_ar)" RANLIB="$($(package)_ranlib)" CC="$($(package)_cc)" CXX="$($(package)_cxx)" CXXFLAGS="$($(package)_cxxflags)"
-endef
+$(package)_sha256_hash=58a6f4277ca2bc8565222b3bbd58a177609e9c488e8a72649359ba51450db7d8
 
 BUILD_OS := $(shell uname)
 ifeq ($(BUILD_OS),Darwin)
@@ -17,10 +13,14 @@ else
 endif
 
 define $(package)_build_cmds
-    $(MAKE) -C make gtest.a
+  $(MAKE) -C googlemock/make CXXFLAGS=-fPIC gmock.a && \
+  $(MAKE) -C googletest/make CXXFLAGS=-fPIC gtest.a
 endef
 
 define $(package)_stage_cmds
-    $($(package)_install) -D ./make/gtest.a $($(package)_staging_dir)$(host_prefix)/lib/libgtest.a && \
-    cp -a ./include $($(package)_staging_dir)$(host_prefix)/include
-endef
\ No newline at end of file
+  mkdir -p $($(package)_staging_dir)$(host_prefix)/lib && \
+  install ./googlemock/make/gmock.a $($(package)_staging_dir)$(host_prefix)/lib/libgmock.a && \
+  install ./googletest/make/gtest.a $($(package)_staging_dir)$(host_prefix)/lib/libgtest.a && \
+  cp -a ./googlemock/include $($(package)_staging_dir)$(host_prefix)/ && \
+  cp -a ./googletest/include $($(package)_staging_dir)$(host_prefix)/
+endef
diff --git a/depends/packages/libsodium.mk b/depends/packages/libsodium.mk
index afc3bc34d..d7717bbfc 100644
--- a/depends/packages/libsodium.mk
+++ b/depends/packages/libsodium.mk
@@ -1,6 +1,6 @@
 package=libsodium
 $(package)_version=1.0.11
-$(package)_download_path=https://download.libsodium.org/libsodium/old/releases/
+$(package)_download_path=https://download.libsodium.org/libsodium/releases/
 $(package)_file_name=libsodium-1.0.11.tar.gz
 $(package)_sha256_hash=a14549db3c49f6ae2170cbbf4664bd48ace50681045e8dbea7c8d9fb96f9c765
 $(package)_dependencies=
diff --git a/depends/packages/openssl.mk b/depends/packages/openssl.mk
index 1bbb49c31..9b92c2c9a 100644
--- a/depends/packages/openssl.mk
+++ b/depends/packages/openssl.mk
@@ -85,6 +85,7 @@ $(package)_config_opts_arm_linux=linux-generic32
 $(package)_config_opts_aarch64_linux=linux-generic64
 $(package)_config_opts_mipsel_linux=linux-generic32
 $(package)_config_opts_mips_linux=linux-generic32
+$(package)_config_opts_powerpc_linux=linux-generic32
 $(package)_config_opts_x86_64_darwin=darwin64-x86_64-cc
 $(package)_config_opts_x86_64_mingw32=mingw64
 $(package)_config_opts_i686_mingw32=mingw
@@ -109,4 +110,4 @@ endef
 
 define $(package)_postprocess_cmds
   rm -rf share bin etc
-endef
\ No newline at end of file
+endef
diff --git a/depends/packages/packages.mk b/depends/packages/packages.mk
index 0b7905e4f..296323c8c 100644
--- a/depends/packages/packages.mk
+++ b/depends/packages/packages.mk
@@ -1,7 +1,7 @@
 rust_packages := rust librustzcash
 proton_packages := proton
 zcash_packages := libgmp libsodium
-packages := boost openssl libevent zeromq $(zcash_packages) googletest googlemock
+packages := boost openssl libevent zeromq $(zcash_packages) googletest
 native_packages := native_ccache
 
 wallet_packages=bdb
diff --git a/depends/packages/zeromq.mk b/depends/packages/zeromq.mk
index 4b335c54c..3cca06dae 100644
--- a/depends/packages/zeromq.mk
+++ b/depends/packages/zeromq.mk
@@ -7,6 +7,7 @@ $(package)_sha256_hash=27d1e82a099228ee85a7ddb2260f40830212402c605a4a10b5e5498a7
 define $(package)_set_vars
   $(package)_config_opts=--without-documentation --disable-shared --disable-curve
   $(package)_config_opts_linux=--with-pic
+  $(package)_cxxflags=-std=c++11
 endef
 
 define $(package)_config_cmds
diff --git a/src/Makefile.am b/src/Makefile.am
index 087f9540f..369b1d54b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,8 @@
 DIST_SUBDIRS = secp256k1 univalue
-AM_LDFLAGS = $(PTHREAD_CFLAGS) $(LIBTOOL_LDFLAGS)
 
+AM_LDFLAGS = $(PTHREAD_CFLAGS) $(LIBTOOL_LDFLAGS) $(HARDENED_LDFLAGS)
+AM_CXXFLAGS = $(HARDENED_CXXFLAGS) $(ERROR_CXXFLAGS)
+AM_CPPFLAGS = $(HARDENED_CPPFLAGS)
 
 if EMBEDDED_LEVELDB
 LEVELDB_CPPFLAGS += -I$(srcdir)/leveldb/include
@@ -14,7 +16,7 @@ $(LIBLEVELDB): $(LIBMEMENV)
 $(LIBLEVELDB) $(LIBMEMENV):
 	@echo "Building LevelDB ..." && $(MAKE) -C $(@D) $(@F) CXX="$(CXX)" \
 	  CC="$(CC)" PLATFORM=$(TARGET_OS) AR="$(AR)" $(LEVELDB_TARGET_FLAGS) \
-          OPT="$(CXXFLAGS) $(CPPFLAGS) -D__STDC_LIMIT_MACROS"
+          OPT="$(AM_CXXFLAGS) $(PIE_FLAGS) $(CXXFLAGS) $(AM_CPPFLAGS) $(CPPFLAGS) -D__STDC_LIMIT_MACROS"
 endif
 
 BITCOIN_CONFIG_INCLUDES=-I$(builddir)/config
@@ -45,8 +47,11 @@ $(LIBSECP256K1): $(wildcard secp256k1/src/*) $(wildcard secp256k1/include/*)
 -include collate-libsnark
 collate-libsnark: $(LIBSNARK)
 
-LIBSNARK_CXXFLAGS = -fPIC -DBINARY_OUTPUT -DNO_PT_COMPRESSION=1
-LIBSNARK_CONFIG_FLAGS = CURVE=ALT_BN128 MULTICORE=1 NO_PROCPS=1 NO_DOCS=1 STATIC=1 NO_SUPERCOP=1 FEATUREFLAGS=-DMONTGOMERY_OUTPUT NO_COPY_DEPINST=1
+LIBSNARK_CXXFLAGS = -fPIC -DBINARY_OUTPUT -DNO_PT_COMPRESSION=1 -fstack-protector-all
+LIBSNARK_CONFIG_FLAGS = CURVE=ALT_BN128 NO_PROCPS=1 NO_DOCS=1 STATIC=1 NO_SUPERCOP=1 FEATUREFLAGS=-DMONTGOMERY_OUTPUT NO_COPY_DEPINST=1 NO_COMPILE_LIBGTEST=1
+if HAVE_OPENMP
+LIBSNARK_CONFIG_FLAGS += MULTICORE=1
+endif
 
 $(LIBSNARK): $(wildcard snark/src/*)
 	$(AM_V_at) CXXFLAGS="$(LIBSNARK_CXXFLAGS)" $(MAKE) $(AM_MAKEFLAGS) -C snark/ install PREFIX=$(srcdir)/build DEPINST="$(LIBSNARK_DEPINST)" $(LIBSNARK_CONFIG_FLAGS) OPTFLAGS="-O2 -march=x86-64"
@@ -230,7 +235,8 @@ obj/build.h: FORCE
 libbitcoin_util_a-clientversion.$(OBJEXT): obj/build.h
 
 # server: hushd
-libbitcoin_server_a_CPPFLAGS = $(BITCOIN_INCLUDES) $(EVENT_CFLAGS) $(EVENT_PTHREADS_CFLAGS)
+libbitcoin_server_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(EVENT_CFLAGS) $(EVENT_PTHREADS_CFLAGS)
+libbitcoin_server_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_server_a_SOURCES = \
   sendalert.cpp \
   addrman.cpp \
@@ -277,6 +283,7 @@ if ENABLE_ZMQ
 LIBBITCOIN_ZMQ=libbitcoin_zmq.a
 
 libbitcoin_zmq_a_CPPFLAGS = $(BITCOIN_INCLUDES) $(ZMQ_CFLAGS)
+libbitcoin_zmq_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_zmq_a_SOURCES = \
   zmq/zmqabstractnotifier.cpp \
   zmq/zmqnotificationinterface.cpp \
@@ -287,6 +294,7 @@ if ENABLE_PROTON
 LIBBITCOIN_PROTON=libbitcoin_proton.a
 
 libbitcoin_proton_a_CPPFLAGS = $(BITCOIN_INCLUDES)
+libbitcoin_proton_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_proton_a_SOURCES = \
   amqp/amqpabstractnotifier.cpp \
   amqp/amqpnotificationinterface.cpp \
@@ -294,7 +302,8 @@ libbitcoin_proton_a_SOURCES = \
 endif
 
 # wallet: hushd, but only linked when wallet enabled
-libbitcoin_wallet_a_CPPFLAGS = $(BITCOIN_INCLUDES)
+libbitcoin_wallet_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+libbitcoin_wallet_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_wallet_a_SOURCES = \
   utiltest.cpp \
   utiltest.h \
@@ -316,7 +325,8 @@ libbitcoin_wallet_a_SOURCES = \
   $(LIBZCASH_H)
 
 # crypto primitives library
-crypto_libbitcoin_crypto_a_CPPFLAGS = $(BITCOIN_CONFIG_INCLUDES)
+crypto_libbitcoin_crypto_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_CONFIG_INCLUDES)
+crypto_libbitcoin_crypto_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 crypto_libbitcoin_crypto_a_SOURCES = \
   crypto/common.h \
   crypto/equihash.cpp \
@@ -348,7 +358,8 @@ crypto_libbitcoin_crypto_a_SOURCES += \
 endif
 
 # common: shared between hushd and non-server tools
-libbitcoin_common_a_CPPFLAGS = $(BITCOIN_INCLUDES)
+libbitcoin_common_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+libbitcoin_common_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_common_a_SOURCES = \
   amount.cpp \
   arith_uint256.cpp \
@@ -378,7 +389,8 @@ libbitcoin_common_a_SOURCES = \
 # util: shared between all executables.
 # This library *must* be included to make sure that the glibc
 # backward-compatibility objects and their sanity checks are linked.
-libbitcoin_util_a_CPPFLAGS = $(BITCOIN_INCLUDES)
+libbitcoin_util_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+libbitcoin_util_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_util_a_SOURCES = \
   support/pagelocker.cpp \
   chainparamsbase.cpp \
@@ -402,8 +414,9 @@ if GLIBC_BACK_COMPAT
 libbitcoin_util_a_SOURCES += compat/glibc_compat.cpp
 endif
 
-# cli: zcash-cli
-libbitcoin_cli_a_CPPFLAGS = $(BITCOIN_INCLUDES)
+# cli: hush-cli
+libbitcoin_cli_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+libbitcoin_cli_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_cli_a_SOURCES = \
   rpcclient.cpp \
   $(BITCOIN_CORE_H) \
@@ -414,7 +427,8 @@ nodist_libbitcoin_util_a_SOURCES = $(srcdir)/obj/build.h
 
 # bitcoind binary #
 hushd_SOURCES = bitcoind.cpp
-hushd_CPPFLAGS = $(BITCOIN_INCLUDES)
+hushd_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+hushd_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 hushd_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 
 if TARGET_WINDOWS
@@ -457,7 +471,8 @@ endif
 
 # bitcoin-cli binary #
 hush_cli_SOURCES = bitcoin-cli.cpp
-hush_cli_CPPFLAGS = $(BITCOIN_INCLUDES) $(EVENT_CFLAGS)
+hush_cli_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(EVENT_CFLAGS)
+hush_cli_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 hush_cli_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 
 # wallet-utility binary #
@@ -505,7 +520,8 @@ endif
 
 # hush-tx binary #
 hush_tx_SOURCES = bitcoin-tx.cpp
-hush_tx_CPPFLAGS = $(BITCOIN_INCLUDES)
+hush_tx_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+hush_tx_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 hush_tx_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 
 if TARGET_WINDOWS
@@ -574,9 +590,10 @@ if GLIBC_BACK_COMPAT
   libzcashconsensus_la_SOURCES += compat/glibc_compat.cpp
 endif
 
-libzcashconsensus_la_LDFLAGS = -no-undefined $(RELDFLAGS)
+libzcashconsensus_la_LDFLAGS = $(AM_LDFLAGS) -no-undefined $(RELDFLAGS)
 libzcashconsensus_la_LIBADD = $(LIBSECP256K1)
-libzcashconsensus_la_CPPFLAGS = -I$(builddir)/obj -I$(srcdir)/secp256k1/include -DBUILD_BITCOIN_INTERNAL
+libzcashconsensus_la_CPPFLAGS = $(AM_CPPFLAGS) -I$(builddir)/obj -I$(srcdir)/secp256k1/include -DBUILD_BITCOIN_INTERNAL
+libzcashconsensus_la_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 
 endif
 #
@@ -600,18 +617,18 @@ clean-local:
 
 .mm.o:
 	$(AM_V_CXX) $(OBJCXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
-	  $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS)  -c -o $@ $<
+	  $(CPPFLAGS) $(AM_CXXFLAGS) $(AM_CXXFLAGS) $(PIE_FLAGS) $(CXXFLAGS) -c -o $@ $<
 
 check-symbols: $(bin_PROGRAMS)
 if GLIBC_BACK_COMPAT
 	@echo "Checking glibc back compat of [$(bin_PROGRAMS)]..."
-	$(AM_V_at) READELF=$(READELF) CPPFILT=$(CPPFILT) $(top_srcdir)/contrib/devtools/symbol-check.py < $(bin_PROGRAMS)
+	$(AM_V_at) READELF=$(READELF) CPPFILT=$(CPPFILT) $(top_srcdir)/contrib/devtools/symbol-check.py $(bin_PROGRAMS)
 endif
 
 check-security: $(bin_PROGRAMS)
 if HARDEN
 	@echo "Checking binary security of [$(bin_PROGRAMS)]..."
-	$(AM_V_at) READELF=$(READELF) OBJDUMP=$(OBJDUMP) $(top_srcdir)/contrib/devtools/security-check.py < $(bin_PROGRAMS)
+	$(AM_V_at) READELF=$(READELF) OBJDUMP=$(OBJDUMP) $(top_srcdir)/contrib/devtools/security-check.py $(bin_PROGRAMS)
 endif
 
 %.pb.cc %.pb.h: %.proto
diff --git a/src/Makefile.gtest.include b/src/Makefile.gtest.include
index a4e322a8f..472b1ac32 100644
--- a/src/Makefile.gtest.include
+++ b/src/Makefile.gtest.include
@@ -39,7 +39,8 @@ zcash_gtest_SOURCES += \
 	wallet/gtest/test_wallet.cpp
 endif
 
-zcash_gtest_CPPFLAGS = -DMULTICORE -fopenmp -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DSTATIC $(BITCOIN_INCLUDES)
+zcash_gtest_CPPFLAGS = $(AM_CPPFLAGS) -DMULTICORE -fopenmp -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DSTATIC $(BITCOIN_INCLUDES)
+zcash_gtest_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 
 zcash_gtest_LDADD = -lgtest -lgmock $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CRYPTO) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) \
   $(BOOST_LIBS) $(BOOST_UNIT_TEST_FRAMEWORK_LIB) $(LIBSECP256K1)
@@ -63,4 +64,4 @@ zcash-gtest_check: zcash-gtest FORCE
 	./zcash-gtest
 
 zcash-gtest-expected-failures: zcash-gtest FORCE
-	./zcash-gtest --gtest_filter=*DISABLED_* --gtest_also_run_disabled_tests
\ No newline at end of file
+	./zcash-gtest --gtest_filter=*DISABLED_* --gtest_also_run_disabled_tests
diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index 35d260097..757d2ed63 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -102,9 +102,10 @@ BITCOIN_TESTS += \
 endif
 
 test_test_bitcoin_SOURCES = $(BITCOIN_TESTS) $(JSON_TEST_FILES) $(RAW_TEST_FILES)
-test_test_bitcoin_CPPFLAGS = -fopenmp $(BITCOIN_INCLUDES) -I$(builddir)/test/ $(TESTDEFS) $(EVENT_CFLAGS)
+test_test_bitcoin_CPPFLAGS = $(AM_CPPFLAGS) -fopenmp $(BITCOIN_INCLUDES) -I$(builddir)/test/ $(TESTDEFS) $(EVENT_CFLAGS)
 test_test_bitcoin_LDADD = $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CRYPTO) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) \
   $(BOOST_LIBS) $(BOOST_UNIT_TEST_FRAMEWORK_LIB) $(LIBSECP256K1) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS)
+test_test_bitcoin_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 if ENABLE_WALLET
 test_test_bitcoin_LDADD += $(LIBBITCOIN_WALLET)
 endif
diff --git a/src/Makefile.zcash.include b/src/Makefile.zcash.include
index e5752cb2f..177931c88 100644
--- a/src/Makefile.zcash.include
+++ b/src/Makefile.zcash.include
@@ -4,6 +4,8 @@ noinst_PROGRAMS += \
 
 # tool for generating our public parameters
 zcash_GenerateParams_SOURCES = zcash/GenerateParams.cpp
+zcash_GenerateParams_CPPFLAGS = $(AM_CPPFLAGS)
+zcash_GenerateParams_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 zcash_GenerateParams_LDADD = \
   $(BOOST_LIBS) \
   $(LIBZCASH) \
@@ -14,7 +16,8 @@ zcash_GenerateParams_LDADD = \
 
 # tool for profiling the creation of joinsplits
 zcash_CreateJoinSplit_SOURCES = zcash/CreateJoinSplit.cpp
-zcash_CreateJoinSplit_CPPFLAGS = $(BITCOIN_INCLUDES)
+zcash_CreateJoinSplit_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+zcash_CreateJoinSplit_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 zcash_CreateJoinSplit_LDADD = \
   $(LIBBITCOIN_COMMON) \
   $(LIBZCASH) \
diff --git a/src/snark/Makefile b/src/snark/Makefile
index 678de8863..1583facf7 100644
--- a/src/snark/Makefile
+++ b/src/snark/Makefile
@@ -27,13 +27,13 @@ INSTALL_LIBS = $(LIB_FILE)
 # Sentinel file to check existence of this directory (since directories don't work as a Make dependency):
 DEPINST_EXISTS = $(DEPINST)/.exists
 
-
-COMPILE_GTEST :=
 ifneq ($(NO_GTEST),1)
-	GTESTDIR=/usr/src/gtest
-# Compile GTest from sourcecode if we can (e.g., Ubuntu). Otherwise use precompiled one (e.g., Fedora).
-# See https://code.google.com/p/googletest/wiki/FAQ#Why_is_it_not_recommended_to_install_a_pre-compiled_copy_of_Goog .
-	COMPILE_GTEST :=$(shell test -d $(GTESTDIR) && echo -n 1)
+	# Compile GTest from sourcecode if we can (e.g., Ubuntu). Otherwise use precompiled one (e.g., Fedora).
+	# See https://github.com/google/googletest/blob/master/googletest/docs/FAQ.md#why-is-it-not-recommended-to-install-a-pre-compiled-copy-of-google-test-for-example-into-usrlocal
+	ifneq ($(NO_COMPILE_LIBGTEST),1)
+		GTESTDIR=/usr/src/gtest
+		COMPILE_LIBGTEST = $(shell test -d $(GTESTDIR) && echo -n 1)
+	endif
 	GTEST_LDLIBS += -lgtest -lpthread
 endif
 
@@ -198,12 +198,9 @@ $(LIBGTEST_A): $(GTESTDIR)/src/gtest-all.cc $(DEPINST_EXISTS)
 
 # libsnark.a will contains all of our relevant object files, and we also mash in the .a files of relevant dependencies built by ./prepare-depends.sh
 $(LIBSNARK_A): $(LIB_OBJS) $(AR_LIBS)
-	( \
-	  echo " $(LIBSNARK_A)"; \
-	  echo " $(LIB_OBJS)"; \
-	  if [ -n "$(AR_LIBS)" ]; then for AR_LIB in $(AR_LIBS); do echo addlib $$AR_LIB; done; fi; \
-	) | xargs  $(AR) -r
-	 $(AR) s $(LIBSNARK_A)
+	$(AR) q $(LIBSNARK_A) $(LIB_OBJS)
+	if [ -n "$(AR_LIBS)" ]; then mkdir -p tmp-ar; cd tmp-ar; for AR_LIB in $(AR_LIBS); do $(AR) x $$AR_LIB; done; $(AR) qc $(LIBSNARK_A) tmp-ar/*; cd ..; rm -r tmp-ar; fi;
+	$(AR) s $(LIBSNARK_A)
 
 libsnark.so: $(LIBSNARK_A) $(DEPINST_EXISTS)
 	$(CXX) -o $@   --shared -Wl,--whole-archive $(LIBSNARK_A) $(CXXFLAGS) $(LDFLAGS) -Wl,--no-whole-archive $(LDLIBS)
@@ -219,13 +216,13 @@ src/gadgetlib2/tests/gadgetlib2_test: \
 $(EXECUTABLES): %: %.o $(LIBSNARK_A) $(DEPINST_EXISTS)
 	$(CXX) -o $@   $@.o $(LIBSNARK_A) $(CXXFLAGS) $(LDFLAGS) $(LDLIBS)
 
-$(EXECUTABLES_WITH_GTEST): %: %.o $(LIBSNARK_A) $(if $(COMPILE_GTEST),$(LIBGTEST_A)) $(DEPINST_EXISTS)
+$(EXECUTABLES_WITH_GTEST): %: %.o $(LIBSNARK_A) $(if $(COMPILE_LIBGTEST),$(LIBGTEST_A)) $(DEPINST_EXISTS)
 	$(CXX) -o $@   $@.o $(LIBSNARK_A) $(CXXFLAGS) $(LDFLAGS) $(GTEST_LDLIBS) $(LDLIBS)
 
 $(EXECUTABLES_WITH_SUPERCOP): %: %.o $(LIBSNARK_A) $(DEPINST_EXISTS)
 	$(CXX) -o $@   $@.o $(LIBSNARK_A) $(CXXFLAGS) $(LDFLAGS) $(SUPERCOP_LDLIBS) $(LDLIBS)
 
-$(GTEST_TESTS): %: $(GTEST_OBJS) $(LIBSNARK_A) $(if $(COMPILE_GTEST),$(LIBGTEST_A)) $(DEPINST_EXISTS)
+$(GTEST_TESTS): %: $(GTEST_OBJS) $(LIBSNARK_A) $(if $(COMPILE_LIBGTEST),$(LIBGTEST_A)) $(DEPINST_EXISTS)
 	$(CXX) -o $@   $(GTEST_OBJS) $(LIBSNARK_A) $(CXXFLAGS) $(LDFLAGS) $(GTEST_LDLIBS) $(LDLIBS)
 
 
diff --git a/zcutil/build.sh b/zcutil/build.sh
index 7f4c6a749..6f3decae1 100755
--- a/zcutil/build.sh
+++ b/zcutil/build.sh
@@ -2,6 +2,22 @@
 
 set -eu -o pipefail
 
+function cmd_pref() {
+    if type -p "$2" > /dev/null; then
+        eval "$1=$2"
+    else
+        eval "$1=$3"
+    fi
+}
+
+# If a g-prefixed version of the command exists, use it preferentially.
+function gprefix() {
+    cmd_pref "$1" "g$2" "$2"
+}
+
+gprefix READLINK readlink
+cd "$(dirname "$("$READLINK" -f "$0")")/.."
+
 # Allow user overrides to $MAKE. Typical usage for users who need it:
 #   MAKE=gmake ./zcutil/build.sh -j$(nproc)
 if [[ -z "${MAKE-}" ]]; then
@@ -11,10 +27,10 @@ fi
 # Allow overrides to $BUILD and $HOST for porters. Most users will not need it.
 #   BUILD=i686-pc-linux-gnu ./zcutil/build.sh
 if [[ -z "${BUILD-}" ]]; then
-    BUILD=x86_64-unknown-linux-gnu
+    BUILD="$(./depends/config.guess)"
 fi
 if [[ -z "${HOST-}" ]]; then
-    HOST=x86_64-unknown-linux-gnu
+    HOST="$BUILD"
 fi
 
 # Allow override to $CC and $CXX for porters. Most users will not need it.
@@ -59,7 +75,6 @@ EOF
 fi
 
 set -x
-cd "$(dirname "$(readlink -f "$0")")/.."
 
 # If --enable-lcov is the first argument, enable lcov coverage support:
 LCOV_ARG=''
@@ -100,18 +115,6 @@ then
     shift
 fi
 
-# Arch workaround for gcc 7
-# might break the entry above to find gcc- on arm
-if [ -f "/etc/arch-release" ]; then
-    if [ -f "/usr/bin/gcc-5" ]; then
-      CC=gcc-5
-      CXX=g++-5
-    else
-      echo 'gcc5 required, please install using "sudo pacman -S gss5"'
-      exit 1
-    fi
-fi
-
 # If --disable-libs is the next argument, build without libs:
 LIBS_ARG=''
 if [ "x${1:-}" = 'x--disable-libs' ]
@@ -130,6 +133,5 @@ ld -v
 
 HOST="$HOST" BUILD="$BUILD" NO_RUST="$RUST_ARG" NO_PROTON="$PROTON_ARG" "$MAKE" "$@" -C ./depends/ V=1
 ./autogen.sh
-CC="$CC" CXX="$CXX" ./configure --prefix="${PREFIX}" --host="$HOST" --build="$BUILD" "$RUST_ARG" "$HARDENING_ARG" "$LCOV_ARG" "$TEST_ARG" "$MINING_ARG" "$PROTON_ARG" "$LIBS_ARG" CXXFLAGS='-fwrapv -fno-strict-aliasing -Wno-builtin-declaration-mismatch -Werror -g'
-cd src
+CC="$CC" CXX="$CXX" ./configure --prefix="${PREFIX}" --host="$HOST" --build="$BUILD" "$RUST_ARG" "$HARDENING_ARG" "$LCOV_ARG" "$TEST_ARG" "$MINING_ARG" "$PROTON_ARG" "$LIBS_ARG" --enable-werror CXXFLAGS='-g'
 "$MAKE" "$@" V=1