Hello!
1. Build gtkmm using the project files provided in gtkmm source package, with MS visual studio 8 compiler with gtk+ libraries built usinggcc compiler on mingw ?
Yes. But you don't need todo it. There is a ready to use gtkmm version for WIN32 (including mingw and VisualStudio8 libraries):
http://www.pcpm.ucl.ac.be/~gustin/win32_ports/ and gtk+ you can get from: http://gladewin32.sourceforge.net/modules/news/
2. Build a gtkmm application with MS visual studio 8 compiler after that.
Yes. Regards, Frank