Sorry this is so late - missed the upgrade.
I've hit problems with this build. When attempting to rebuild the latest Gtkam, I get the following error:
libtool: link: cannot find the library `/usr/lib/libltdl.la' or unhandled argument `/usr/lib/libltdl.la'
Looking at the SlackBuild, I see that it has been set up to use '--prefix=/opt/gnome2' instead of the more normal '--prefix=/usr'. Is there some reason that it should be done this way? Especially since libtool itself is obviously looking in usr/lib for its support libraries?