Without touching anything, I get this,
Armagetron dedicated from this same source compile just fine.The run destination My Mac 64-bit is not valid for Running the scheme 'Armagetron Advanced 10.2.8'. The scheme 'Armagetron Advanced 10.2.8' contains no buildables that can be built for the SDKs supported by the run destination My Mac 64-bit. Make sure your targets all specify SDKs that are supported by this version of Xcode.
Thoughts?