diff options
| -rw-r--r-- | lisp/progmodes/prolog.el | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/lisp/progmodes/prolog.el b/lisp/progmodes/prolog.el index 9ee405b31e1..212a5fa69ab 100644 --- a/lisp/progmodes/prolog.el +++ b/lisp/progmodes/prolog.el @@ -1374,8 +1374,20 @@ the variable `prolog-prompt-regexp'." () (with-current-buffer (get-buffer-create "*prolog*") (prolog-inferior-mode) - (apply 'make-comint-in-buffer "prolog" (current-buffer) - (prolog-program-name) nil (prolog-program-switches)) + + ;; The "INFERIOR=yes" hack is for SWI-Prolog 7.2.3 and earlier, + ;; which assumes it is running under Emacs if either INFERIOR=yes or + ;; if EMACS is set to a nonempty value. The EMACS setting is + ;; obsolescent, so set INFERIOR. Newer versions of SWI-Prolog should + ;; know about INSIDE_EMACS (which replaced EMACS) and should not need + ;; this hack. + (let ((process-environment + (if (getenv "INFERIOR") + process-environment + (cons "INFERIOR=yes" process-environment)))) + (apply 'make-comint-in-buffer "prolog" (current-buffer) + (prolog-program-name) nil (prolog-program-switches))) + (unless prolog-system ;; Setup auto-detection. (setq-local |