title: xCode 5.1 doesn't recognize a class in the file system "relative to folder" (real folder)
body: <p>I am using xCode 5.1, but when I try to include a folder that contains two files (.m and  .h) as "folder reference" in place of "group", </p>
  
  <p><img src="https://i.imgur.com/1ZvJ6SB.png" alt="folder reference"></p>
  
  <p>I have to include the path folder in the "Build settings --> Header search paths" else xcode says "files not found".<br>
  The problem is that when I include the folder's path I found another error "Undefined symbols for architecture XXX", but the problem can't be the architecture. I think the problem is that the project hasn't access to the .m file inside the folder referenced.</p>
  
  <p>I have tried also to drag the .m file to ‘Build phases—>Compile Sources’ and… xCode crash, always. I do 'clean build folder' but the result is the same.</p>
  
  <p>If, instead of including the entered folder in the project navigator, I drag the files, there is not problem, but, when i insert new files in the folder, they don't appear in my project navigator.  Any input would be appreciated, thanks!</p>