As of clisp 2.42, new-clx works with stumpwm (thanks to stumpwm's author's contributions). new-clx is preferred to mit-clx because the former does not require any manipulation of X access controls (xhosts, etc.). I propose changing the x11-wm/stumpwm-cvs to depend on clisp 2.42 or newer and to prefer new-clx to mit-clx.
*** This bug has been marked as a duplicate of bug 196982 ***