I\'m getting error message about permission denied, when I build any app on Xcode 4:
error: unable to create \'/Users/mike/Library/Developer/Xcode/Der
please check your Xcode version and upgrade your Xcode. early I was using Xcode 6.1 and I got error message with that Xcode version after then I upgrade Xcode Version 6.2. now It is working perfectly. when you upgrade your OS X version You should upgrade Xcode version.
Ok. It seems you may be restricted to create Build Folder in your system. Try out the procedure below which creates a Build Folder in project folder itself.
In Xcde menu bar go to: Preferences > Locations Tab. In Locations change Derived Data to Relative and set any name in the text box. I have used "Build". This folder will be created in your project folder for built binaries.