System 5 Release 4 machine (for example Solaris2)
The variant of FreeBSD underlying Mac OS X.
Unix, including all of the above.
32-bit versions of Microsoft Windows (including Windows 95 and Windows NT)
The compiler targets a little endian machine, for instance DEC Alpha and x86.
All major version 4 releases.
All major version 5 releases.
Note that sometimes it is necessary to write code that examines
at load time or run time. For example this is true when you put platform-dependent code in fasl files that are shared between multiple platforms.
Note: LispWorks for Macintosh supports the native Mac OS Cocoa-based GUI and the X11/Motif GUI. If you need to test for which of these libraries is loaded, check for the features