def METHOD_NAME():
    """Set (dont overwrite) CC/CXX so that apps dont use the build-time ones"""
    ccompiler = new_compiler()
    _customize_compiler(ccompiler)
    # xcrun wrapper must bring all args
    if ccompiler.compiler[0] == "xcrun":
        ccompiler.compiler[0] = get_config_var("CC")
        ccompiler.compiler_cxx[0] = get_config_var("CXX")
    os.environ.setdefault("CC", ccompiler.compiler[0])
    os.environ.setdefault("CXX", ccompiler.compiler_cxx[0])