Wayne, I think Mandrake uses rpm like the Red Hat distributions from which if forked so the following commands should help you find the origin of the system libraries rpm -qa | grep esa will find all the Mesa rpms installed rpm -ql XFree86-Mesa-libGL-<version> will tell you the files installed by the Mesa package rpm -qf /usr/X11R6/lib/libGL.so.<version> will tell you which package is responsible for installing a particular file (of course assuming that a later, non-rpm installation hasn't trampled it as the NVidia drivers might for example) Brian -- Dr. Brian O. Smith ---------------------- B.Smith at bio.gla.ac.uk Division of Biochemistry & Molecular Biology, Institute Biomedical & Life Sciences, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK. Tel: 0141 330 5167/6459 Fax: 0141 330 8640