I figured out my problem. When I copied the build files into the C::B directory, my directories settings were still stored in the registry. The new build only saw the stuff in the %APPDATA%. This meant that my mingw directory (the prepackage one) was not in the list of directoires. I can't test this out tonight, but I plan on doing it tomorrow or on Friday when I get the time. The error now makes sense because it was not seeing the mingw.