Make sure the build system honors CPATH and LIBRARY_PATH when looking for headers and libraries. --- setup.py 2015-10-07 23:32:58.891329173 +0200 +++ setup.py 2015-10-07 23:46:29.653349924 +0200 @@ -575,8 +575,8 @@ # if a file is found in one of those directories, it can # be assumed that no additional -I,-L directives are needed. if not cross_compiling: - lib_dirs = self.compiler.library_dirs + system_lib_dirs - inc_dirs = self.compiler.include_dirs + system_include_dirs + lib_dirs = os.getenv('LIBRARY_PATH', '').split(os.pathsep) + inc_dirs = os.getenv('CPATH', '').split(os.pathsep) else: # Add the sysroot paths. 'sysroot' is a compiler option used to # set the logical path of the standard system headers and