Variable: makefile-backslash-align
makefile-backslash-align is a customizable variable defined in
make-mode.el.gz.
Value
t
Documentation
If non-nil, makefile-backslash-region will align backslashes.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/make-mode.el.gz
(defcustom makefile-backslash-align t
"If non-nil, `makefile-backslash-region' will align backslashes."
:type 'boolean)