http://bugs.gentoo.org/307349

--- maxima-5.20.1-orig/interfaces/emacs/emaxima/maxima.el
+++ maxima-5.20.1/interfaces/emacs/emaxima/maxima.el
@@ -2109,6 +2109,7 @@
 ;;; The next functions are from comint.el in cvs emacs
 (if (and
      (not maxima-running-xemacs)
+     (<= emacs-major-version 21)
      (or
       (< emacs-major-version 21)
       (< emacs-minor-version 3)))