Defenitively, your qt3 installation is somehow broken or you took the wrong source. I've just downloaded http://staff.mbi-berlin.de/gerlach/Linux/LabPlot/src/LabPlot-1.2.3.tar.gz and made a simple ./configure on my Suse 8.1: checking for Qt... libraries /usr/lib/qt3/lib, headers /usr/lib/qt3/include using -mt checking if Qt compiles without flags... no checking for moc... /usr/lib/qt3/bin/moc checking for uic... /usr/lib/qt3/bin/uic checking whether uic supports -L ... yes checking whether uic supports -nounload ... yes checking if Qt needs -ljpeg... no all is fine, ready for make. If you have the 8.1 qt3 really installed (release -47, non-mt release -49) then -from my point of view - it can be the source only. Udo P.S. don't upgrade the kernel or xfree unless you really know, what you are doing, i.e know how to cope with the issues that will show up.