makefile-imenu-generic-expression

makefile-imenu-generic-expression is a variable defined in `make-mode.el'.
Its value is

(("Dependencies" makefile-previous-dependency 1)
 ("Macro Assignment" "\\(?:^\\|^export\\|^override\\|:\\|: *override\\) *\\([^ \n	][^:#= 	\n]*\\)[ 	]*\\(?:!=\\|[*:+]?[:?]?=\\)" 1))

Documentation:
Imenu generic expression for Makefile mode. See `imenu-generic-expression'.