From log of qt3-libs/Makefile:

----------------------------
(Applications which just use qt3 shouldn't be affected because each
program using qt3 has an RPATH into both LOCALBASE and X11BASE.)
----------------------------

Sorry, that's not completely true.  I tried a "make replace" to move to the
relocated qt3, and my already installed binaries fail:

$ ldd /usr/X11R6/bin/kuickshow | grep 'not found' | sort | uniq -c
  25	-lqt-mt.3 => not found

"Oops."
Looks like you need to bump all of the KDE app PKGREVISIONs, too:

$ ldd /usr/X11R6/lib/libkdecore.so | grep 'not found'
	-lqt-mt.3 => not found
	-lqt-mt.3 => not found

-- 
-- Todd Vierling <tv@pobox.com>