Most commercial Unix systems have the Motif library standardly included. However, Motif is often not included in older operating systems like SunOS or in free operating systems like Linux. Therefore there are two Linux and two SunOS distributions of TCM. One has the Motif library statically linked in and the other has not. The distributions that contain a statically linked Motif library have the string -motif- in their file names. Motif itself is copyrighted so we are not allowed to put the Motif library itself (libXm.so) in the distributions. Of course you can also buy Motif yourself. See the web page http://www.rahul.net/kenton/faqs/mfaq_index.html for the Motif FAQ including where you can get Motif.