LispWorks 5.1 for Macintosh on X11/Motif requires Open Motif 2.3.
The library for 32-bit LispWorks is
/usr/local/lib/libXm.4.dylib
. You can can build a PowerPC or Intel binary from the sources at
www.motifzone.net
.
Apple do not currently support a 64-bit X11 installation. Contact Lisp Support if you need a library suitable for 64-bit LispWorks.