sbo gtkglext slackbuild

The SBO slackbuild for gtkglext failed for me. So did my efforts to compile it, naturally. Couldn't find a Ponce version. Near as I can tell, something in glib bothers it. Probably something changed. Has anyone recently gotten this to compile in current and did you do anything special to do so? I'm running Slackware current 64 bit, from november 14th. Thank you.

p.s. running a multilib slackware but since I am not attempting to compile a 32-bit version, this should not matter?

p.p.s. yikes, the source is from 2006. Yeah, that might explain things.