def METHOD_NAME(self, spec, prefix):
    # https://doc.pypy.org/en/latest/build.html#build-cffi-import-libraries-for-the-stdlib
    build_cffi_imports = join_path(
        self.stage.source_path, "lib_pypy", "pypy_tools", "build_cffi_imports.py"
    )
    pypy_c = Executable(join_path(self.build_directory, f"pypy{self.version.up_to(2)}-c"))
    with working_dir(self.build_directory):
        pypy_c(build_cffi_imports, *self.build_args())