I got the following problem while installing the restkit on xcode 4.5 ,
clang: error: no such file or directory: ‘/Users/omar/Library/Developer/Xcode/DerivedData/MYApplication-bdmknibmydzygicvcnkavqemwxic/Build/Products/Debug-iphonesimulator/RestKit/RestKit’
i read the trouble shooting manual but it does not fix my issue https://github.com/RestKit/RestKit/wiki/Installation-Troubleshooting
I fixed my problem by downloading the restkit files as in the documentation,
then from terminal try to update the git repo of the restkit
I hope this will fix any one faced the same issue.