Well, I did that, and GAIM and GTK do indeed install. But in order for GAIM to work, I have to manually install GTK again, then use the update option in the desktop menu.
My Guess is: Gaim and GTK load in that order, since they load alphabetically. Rename gaim.dsl to zz_gaim.dsl, to make it load after GTK. Let me know if it helped.
original here.