该软件包在Catalina上不存在. 在Catalina Beta上安装Xcode Beta后，可以在以下位置使用这些头文件:

That package does not exist on Catalina. After installing Xcode Beta on Catalina beta, the headers are available on:

/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/

/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/

您可能需要调整您的书架路径

You may have to adjust your library path