LispWorks uses GTK+ as the default window system for CAPI and the LispWorks IDE on Linux, FreeBSD and x86/x64 Solaris. GTK+ is also supported on macOS as an alternative to Cocoa. LispWorks requires GTK+ 2 (version 2.4 or higher).
A few known problems are documented on 12.17.1 Problems with CAPI on GTK+.
Use of Motif with LispWorks on Linux, FreeBSD, x86/x64 Solaris and macOS is deprecated, but it is available by:
(require "capi-motif")
To use LispWorks 8.0 with Motif you also need Imlib2 (on Linux, FreeBSD and macOS) or Imlib (on Solaris) installed, as described earlier in this manual.
LispWorks 8.0 requires Imlib2 1.4.3 or later to use the Motif GUI on Linux, FreeBSD and macOS. Some older versions of LispWorks required Imlib, which is a different library and is still required on Solaris.
Release Notes and Installation Guide - 01 Dec 2021 19:38:49