title: How to add facebook open source code pop to project directly
body: <p>I have downloaded the facebook open source code <strong>pop</strong> from <a href="https://github.com/facebook/pop/blob/master/pop/POP.h" rel="noreferrer">github</a>. But all header files are imported like this: <code>#import &lt;POP/POPAnimatableProperty.h&gt;</code>. What should I to  do with project setting to support import file like this in my project. I know that I can run it by replace all <code>#import &lt;POP/XXX.h&gt;</code> with <code>#import XXX.h</code> but I'd to use the open source like the pop sample project.</p>