setupext.py 文件源码

def check(self):
        if sys.platform == 'win32':
            check_include_file(get_include_dirs(), 'ft2build.h', 'freetype')
            return 'Using unknown version found on system.'

        status, output = getstatusoutput("freetype-config --ftversion")
        if status == 0:
            version = output
        else:
            version = None

        # Early versions of freetype grep badly inside freetype-config,
        # so catch those cases. (tested with 2.5.3).
        if version is None or 'No such file or directory\ngrep:' in version:
            version = self.version_from_header()

        # pkg_config returns the libtool version rather than the
        # freetype version so we need to explicitly pass the version
        # to _check_for_pkg_config
        return self._check_for_pkg_config(
            'freetype2', 'ft2build.h',
            min_version='2.3', version=version)