LispWorks 6.1 for Macintosh on X11/Motif requires Open Motif 2.3 and Imlib.
The Open Motif library for 32-bit LispWorks is
/usr/local/lib/libXm.4.dylib
.
Lisp Support can supply suitable Motif and Imlib libraries if you need them.
Note: The Motif GUI is deprecated. A GTK+ GUI is available.
LispWorks Release Notes and Installation Guide - 23 Dec 2011