I’ve never compiled before on OS X or using g++, but after opening my project and attempting to compile I get the following error:
../../../QtSDK/Desktop/Qt/474/gcc/include -I. -I../FATX -I. \
-F/Users/landerbrandt/QtSDK/Desktop/Qt/474/gcc/lib \
-o xMultiFileStream.o ../FATX/IO/xMultiFileStream.cpp
make: g++-4.2: No such file or directory
make: *** [xMultiFileStream.o] Error 1
Not too sure what the issue is here since it compiles just fine under Windows (using MSVCC though, of course).
The answer was found here: http://developer.qt.nokia.com/forums/viewthread/12682
It appears that the solution Tobias proposed worked.