+;; Add the Makefile prefix to the auto-mode-alist:
+(add-to-list 'auto-mode-alist '("Makefile" . makefile-mode))
+
+;; Autoconf mode
+(add-to-list 'auto-mode-alist
+ '("/configure\\.\\(ac\\|in\\)\\'" . autoconf-mode))
+(add-to-list 'auto-mode-alist
+ '("/ac\\(include\\|local\\)\\.m4\\'" . autoconf-mode))
+