Motif(r) is the industry standard graphical user interface, (as defined by the IEEE 1295 specification), used on more than 200 hardware and software platforms. It provides application developers, end users, and system vendors with the industry's most widely used environment for standardizing application presentation on a wide range of platforms. Motif is the leading user interface toolkit for the UNIX(r) system. Here is what you might ask. (excerpted from The Open Group FAQ) Q: What is Open Motif? How does it differ from standard Motif? A: Aside from some different copyright and license statements, both Motif and Open Motif share the same functionality and source code. The primary difference is the software license for each of the software products. Open Motif source code and binaries can be distributed royalty free under The Open Group Public License as long as the operating system upon which Open Motif is running meets the OSI's Open Source Definition. Motif is made available under the standard Open Group software licenses and requires the payment of source code and royalty fees. NOTE: Some ports with GNU configure do not know that Motif 2.1 requires -lXp. In that case, you need to edit Makefile after configure, or, hack configure(.in) before configure. WWW: http://www.opengroup.org/openmotif/