Errors installing on OS X

[pkerpedjiev]

When running python setup.py install on OS X, I get the following errors:

pngwrite.c:7:10: fatal error: 'png.h' file not found

or

udc.c:39:10: fatal error: 'openssl/sha.h' file not found

[pkerpedjiev]

Fixed by setting the C_INCLUDE_PATH and LIBRARY_PATH environment variables to point to the locations of these headers and libraries, respectively:

export C_INCLUDE_PATH="/usr/local/lib:/usr/local/include/libpng16:/usr/local/opt/openssl/include"
export LIBRARY_PATH="/usr/local/lib:/usr/local/include/libpng:/usr/local/opt/openssl/include"

[flekschas]

@nvictus Would be great to mention this somewhere on the readme (maybe at the end under a trouble shooting section)

[nvictus]

I guess the lesson is that libpng and openssl are also requirements.

[nvictus]

I assume the required paths being at /usr/local/include and /usr/local/opt is specific to homebrew.

[nvictus]

Was the LIBRARY_PATH update even necessary? Also if libpng symlinks to libpng16 then it would be more robust to just use libpng.

[flekschas]

Not sure, I've only tested with both exports being available. And yes /usr/local/opt/openssl/include is related to homebrew.

[nvictus]

Ok, so this happened to me now, and on Ubuntu, and even after installing libpng and openssl with conda (rather than via apt). The header files are just in a non-obvious place and it's not just homebrew's misbehavior. We might be able to handle this in most cases by adding sys.prefix + '/libpng16' and sys.prefix + '/openssl' to the include directories in setup.py.

[nvictus]

d9304f7 hopefully does the trick. No need to set the env vars manually. Could @pkerpedjiev or @flekschas test on a mac?

[flekschas]

@nvictus Works for me now

[snikumbh]

I just wished to report that I also faced this problem for openssl/sha.h on debian using linuxbrew. Setting the C_INCLUDE_PATH did the job for me. Thanks.

[jakevc]

On MacOS 10.14.4 I had this same issue pip installing a package that depended on pybbi, I did a brew install libpng, and that fixed it.