Directory not found for option..

从Stackoverflow转载的答案，解决了我的问题：

There are two errors that people seem to be confusing.

1. If it is a "directory not found for option '-L/..." error, that means it's a Library Error, and you should try to:

Click on your project (targets)

Click on Build Settings

UnderLibrary Search Paths, delete the paths

2. If it is a "directory not found for option '-F/...", that means it's a Framework Error, and you should try to:

Click on your project (targets)

Click on Build Settings

UnderFramework Search Paths, delete the paths