def METHOD_NAME(self, arch=None):
    env = os.environ.copy()
    openssl_prereq = OpenSSLPrerequisite()
    if env.get("PKG_CONFIG_PATH", ""):
        env["PKG_CONFIG_PATH"] = os.pathsep.join(
            [openssl_prereq.pkg_config_location, env["PKG_CONFIG_PATH"]]
        )
    else:
        env["PKG_CONFIG_PATH"] = openssl_prereq.pkg_config_location
    return env