title: Xcode "directory not found for option -L" errors
body: <p>I'm getting these errors:</p>
  
  <pre><code>ld: warning: directory not found for option '-L"/pathToMyApp/MyApp/Shared/Libraries/ADMS_AppLibrary"'
  ld: warning: directory not found for option '-L"/pathToMyApp/MyApp/Shared/Libraries/TestFlightSDK1.1"'
  ld: warning: directory not found for option '-L"/pathToMyApp/MyApp/Shared/Libraries/Medialets"'
  ld: library not found for -lTestFlight
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>These directories do in fact exist at the paths above.</p>
  
  <p>The thing is, the app used to compile fine. All I did was add a new version of the Medialets library to the project, and now I get these erros.</p>