Hi Stephan
> >>I'll keep you posted on the rebuild > Did the rebuild and still had the same errors. in the end ensuring Optimzier is included before anything that includes the Foundation Frameworks Foundation.h and probably others. To illustrate the compile error try adding the following to the top of your AppDelegate.h file #import <Foundation/Foundation.h> #include <osgUtil/Optimizer> So in the end it's not a show stoping compile error, you can avoid it by doing the above includes in the reverse order, but ultimately it seems using YES and NO should be avoided to prevent include order headaches. Everything else is now fine, 2.9.10 trunk built for IOS 4.1 using XCode 3.2.4, run on IPod 4th gen in OpenGL ES 2 mode. Cheers Tom
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