try

.travis.yml

@@ -55,7 +55,6 @@ addons:
     - pkg-config
     - libffi-dev
     - libgmp-dev
-    - patchelf
 before_install:
 - cd $HOME
 - mkdir bin

.travis/deploy.sh

@@ -24,6 +24,7 @@ else
 		python -m pip install wheel
 		python setup.py bdist_wheel
 		python3 -m pip install wheel auditwheel pyelftools typing
+		git clone https://github.com/NixOS/patchelf.git && cd patchelf* && ./configure && make && make install && cd ..
 		auditwheel repair dist/coincurve*.whl
 		rm dist/coincurve*.whl
 		mv coincurve*.whl dist