libgtk-x11-2.0.so requires libEGL.so.1, which in TC14 was pulled in via pango.tcz in the dep file, however in TC15 libEGL.tcz doesn't get loaded and GTK2 programs fail to run until it is.
I suggest that the following line be added in gtk2.tcz.dep for TC15 x86_64 (maybe also x86?) to fix this:
libEGL.tcz
Thank you.