title: clang: error: no such file or directory
body: <p>Added JSONKit to an Xcode project and am getting this error:</p>
  
  <pre><code>clang: error: no such file or directory: '/Users/snowcrash/Downloads/ILGeoNames-develop/SampleApp/../JSONKit/JSONKit.m' 
  clang: error: no input files 
  Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1
  </code></pre>
  
  <p>However, the JSONKit files do appear to be there. E.g.</p>
  
  <p><img src="https://i.stack.imgur.com/Dsqf0.jpg" alt="enter image description here"></p>
  
  <p>How do I figure out the problem (and fix it!)?</p>