Package is not building on MacOSX

Created by: tiagofrepereira2012

The master branch of this package is not building on macosx.

Follow below a piece of the log. The full log (py 2.7) can be found here (https://gitlab.idiap.ch/biometric/bob.nightlies/builds/2970)

/Users/buildbot/work/gitlab-ci/work/gitlab-ci/f6f95b82/0/biometric/bob.nightlies/layers/1/bob.io.image/bob/io/image/include/bob.io.image/config.h:93:30: error: use of undeclared identifier 'GIF_LIB_VERSION'
   return Py_BuildValue("s", GIF_LIB_VERSION);
                             ^
1 error generated.
error: command '/usr/bin/clang' failed with exit status 1
While:
  Installing.
  Processing develop directory '/Users/buildbot/work/gitlab-ci/work/gitlab-ci/f6f95b82/0/biometric/bob.nightlies/layers/1/bob.io.image'.