freebsd changes for boost

depends/packages/boost.mk

@@ -6,12 +6,17 @@ $(package)_sha256_hash=59c9b274bc451cf91a9ba1dd2c7fdcaf5d60b1b3aa83f2c9fa143417c
 $(package)_file_name=$(package)_$($(package)_version).tar.bz2
 $(package)_patches=fix-Solaris.patch
 
+ifneq ($(host_os),darwin)
+$(package)_dependencies+=libcxx
+endif
+
 define $(package)_set_vars
 $(package)_config_opts_release=variant=release
 $(package)_config_opts_debug=variant=debug
 $(package)_config_opts=--layout=system --user-config=user-config.jam
 $(package)_config_opts+=threading=multi link=static -sNO_BZIP2=1 -sNO_ZLIB=1
 $(package)_config_opts_linux=threadapi=pthread runtime-link=shared
+$(package)_config_opts_freebsd=cxxflags=-fPIC
 $(package)_config_opts_darwin=--toolset=gcc runtime-link=shared threadapi=pthread
 $(package)_config_opts_mingw32=binary-format=pe target-os=windows threadapi=win32 runtime-link=static
 $(package)_config_opts_x86_64_mingw32=address-model=64
@@ -24,6 +29,14 @@ $(package)_archiver_darwin=$($(package)_ar)
 $(package)_config_libraries=chrono,filesystem,program_options,system,thread,test
 $(package)_cxxflags=-std=c++11 -fvisibility=hidden
 $(package)_cxxflags_linux=-fPIC
+$(package)_cxxflags_freebsd=-fPIC
+
+ifeq ($(host_os),freebsd)
+  $(package)_ldflags+=-static-libstdc++ -lcxxrt
+else
+  $(package)_ldflags+=-static-libstdc++ -lc++abi
+endif
+
 endef