I am thinking that is the problem. From a Windows command line, if I call
I downloaded an updated mingw folder from here: http://ic3man5.wordpress.com/2012/03/04/updating-mingw-gccg-for-qt-creator-windows/ and am going to replace the mingw folder in C:\QtSdk. Hopefully that will work.
EDIT -- That fixed it! I updated g++ using the link above. Now I am getting other problems though, such as
cannot find -lboost_filesystem-mt
multiple definition of 'std::out_of_range::~out_of_range()'
Will keep working on it