Hello, The upstream tqtinterface uses by default a qt library path of $QTDIR/lib$LIBDIRSUFFIX, but Qt uses lib instead of lib64 within its "private" directory: -with the default build options, both for qt3 and qt4 -in the Debian Squeeze qt3 package. The patch attached to this e-mail solves this inconsistency and makes TQt3 build successfully with default options on Slackware, without specifying the Qt libdir.