Well, I finally got xine to play h.264 video from a .mov file.
I took Dexter's advice after I tried to get 1.1.0 lib and 99.4 ui
running unsuccessfully and went through my system and deleted all xine
related files. Between the original Slackware xine-lib 1.0.0
installation and my 1.1.0/99/4 attempt I had files in the "standard"
directories and the old ones in Slackware's non-standard directories.
IE. libxine in /usr/lib instead of /usr/local/lib, which meant there
were two libxine.so.1 libraries...
After the clean I rebuilt/installed xine-lib 1.1.0, did an ldconfig and
then rebuilt/installed xine-ui 0.99.4.
Lo and behold I could play the h.264 video. It brought tars to my eyes :-).
Now the only glitch is if I start xine with no input specified I get two
error windows about not finding an input plugin to handle
Oh well, worry about that later. I can play h.264.
Thanks for all who responded and helped me out.