I updated Xcode to 6.0.1 and found I cannot compile the Qt project in Qt creater anymore because of this:

warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk'

error: 'TargetConditionals.h' file not found

Can anyone help me, please? How can I solve this?

Thanks!