Build Qt under cygwin with gcc

Hi everybody,

My application need to use OpenMP, on linux there is no problems GCC supports well.
Now on Windows I'm using Qt with VC++ Express and it doesn't support OpenMP.
I cannot use it with Mingw, I have many libraries that need to be build with VC++, or with Cygwin gcc. So my last possibility is use Cygwin GCC.
I would like to know, can I build Qt 4.5.1 from source using Cygwin and GCC cygwin?
If yes is there a list of the minimum requirements of cygwin? (packages to install)

Thank you very much.