GTK+ is free software and part of the GNU Project. However, the licensing terms for GTK+, the GNU LGPL, allow it to be used by all developers, including those developing proprietary software, without any license fees or royalties.
Moja greska GTK je pod LGPL-om ( sto tebi vise odgovara ), a vise o njemu na:
http://en.wikipedia.org/wiki/GNU_Lesser_General_Public_LicensePa sam i pravis licencu za svoj program, ali si ti pitao o GPL-u...
P.S. Prvo ti napravi taj program, i neka on radi posao, pa se posle brini o licencama...