;; Add the .mak suffix to the auto-mode-alist:
(setq auto-mode-alist (cons '("\\.mak$" . makefile-mode) auto-mode-alist))
+;; Add the Makefile prefix to the auto-mode-alist:
+(add-to-list 'auto-mode-alist '("Makefile" . makefile-mode))
+
;; When an Emacs init file gets large or has a lot of function definitions, you
;; should consider compiling it: it will load faster when Emacs starts, and its
;; functions will execute faster.