From 22b14300cb9d3a733ed06b855bda03ea7f350110 Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adam@chlipala.net>
Date: Sun, 18 Oct 2015 14:38:20 -0400
Subject: Grandfathered into release: make urweb-mode keep working in Emacs 23

---
 configure.ac            | 2 +-
 src/elisp/urweb-mode.el | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 451fee29..ee76f9ee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_INIT([urweb], [20151018])
-WORKING_VERSION=1
+WORKING_VERSION=0
 AC_USE_SYSTEM_EXTENSIONS
 
 # automake 1.12 requires this, but automake 1.11 doesn't recognize it
diff --git a/src/elisp/urweb-mode.el b/src/elisp/urweb-mode.el
index db08e1e0..bc71a052 100644
--- a/src/elisp/urweb-mode.el
+++ b/src/elisp/urweb-mode.el
@@ -377,7 +377,11 @@ See doc for the variable `urweb-mode-info'."
 (add-to-list 'auto-mode-alist '("\\.urs?\\'" . urweb-mode))
 
 ;;;###autoload
-(define-derived-mode urweb-mode prog-mode "Ur/Web"
+(defalias 'urweb-mode-derived-from
+  (if (fboundp 'prog-mode) 'prog-mode 'fundamental-mode))
+
+;;;###autoload
+(define-derived-mode urweb-mode urweb-mode-derived-from "Ur/Web"
   "\\<urweb-mode-map>Major mode for editing Ur/Web code.
 This mode runs `urweb-mode-hook' just before exiting.
 \\{urweb-mode-map}"
-- 
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