def _exclude_pkg_path(self, pkg, exclusion_path):
        """
        Given a package name and exclusion path within that package,
        compute the full exclusion path.
        """
        parts = pkg.split('.') + [exclusion_path]
        return os.path.join(self.install_dir, *parts)

        Given a package name and exclusion path within that package,
        compute the full exclusion path.
        
product/gradle-plugin/src/main/python/setuptools/command/install_lib.py