autoconf-mode
autoconf-mode is an interactive autoloaded compiled Lisp function in `autoconf.el
'.
(autoconf-mode)
Parent mode: `prog-mode'.
Major mode for editing Autoconf configure.ac files.
In addition to any hooks its parent mode `prog-mode' might have run,
this mode runs the hook `autoconf-mode-hook', as the final step
during initialization.
key binding
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