Specializing on lispworks8 will fail on future LispWorks releases.

[Yehouda]

magicl/src/extensions/common/with-array-pointers.lisp

Line 35 in 6b49aee

#- (or sbcl ccl ecl allegro lispworks8)

This conditionalization will fail when LispWorks moves to 9.
it should be changed to something like

(and lispworks (not (or lispworks7 lispworks6)))

or plain Lispworks, so it just errors for earlier versions.