With some help from Peter O'Gorman, I got KDE-Darwin's admin/ tree updated to libtool 1.5 CVS -- it's building perfectly after one minor patch that has been sent upstream to the libtool folks, so in theory, if we can get KDE to update to 1.5 when it's released, a large part of the darwin-specific patches won't be needed!
I'm double-checking the build right now, and if all looks good, I'll see if I can get my (other) admin patches into KDE upstream tomorrow.