Combining QT4 with larger C project

[thuswa]

I'm thinking of trying to use Qt4 to create a Gui for a larger project written in C.
The question is what is the best way to achieve this with minimal changes to the original C code.

Coding examples would be nice. :p

TIA

[nish]

leave the C code in a library and link it with your GUI app. Search for "extern C"