If I had a nickel for every time I had to scour the web to figure out the right setting for QTDIR on {Debian,Ubuntu,OS X}…

On OS X, if you installed the qt3 package, then the proper setting is QTDIR=/opt/local/lib/qt3. I wrote this little script to source before commencing building a Qt3 project:

#QTDIR=/usr/local/Trolltech/qt-mac-free-3.3.7
#QTDIR=/Developer/qt
QTDIR=/opt/local/lib/qt3
PATH=$QTDIR/bin:$PATH
DYLD_LIBRARY_PATH=$QTDIR/lib:$DYLD_LIBRARY_PATH

export QTDIR PATH DYLD_LIBRARY_PATH

by Hans Fugal at 4:38 AM under mac , macports , qt , qt3 , qtdir