pkgconfig <- ./pkgconfig-0.15.0.nix
glib <- ./glib-2.2.1.nix
atk <- ./atk-1.2.0.nix
pango <- ./pango-1.2.1.nix
src = url(ftp://ftp.gtk.org/pub/gtk/v2.2/gtk+-2.2.1.tar.bz2)
build = ../build/gtk+-build.sh