Is this Qt backwards compatible with 4.4.3

[ChrisW67]

It's very unlikely that anything built with 4.4.3 will fail to build with 4.6.3 or 4.7.0. If it does, it will most likely fail in compilation because of API differences, and not at link time. It looks like the GCC C++ support library is not being found or you are linking a library built with a different version of GCC and/or Qt . Are you using the Nokia provided SDK or have you built MingW for yourself? Have your cleaned the project and any libraries, rerun qmake, and built from scratch?