1FOO = $PATH
 2
 3FOO_SPACE_BAR:=foo bar
 4FOO_COMMA_BAR:=foo,bar
 5$(FOO_SPACE_BAR):=$PATH
 6$(FOO_COMMA_BAR):=$PATH
 7
 8FOOREF := FOO
 9
10X=$(X)
11
12test:
13	echo $(FOO)
14	echo $(value FOO)
15	echo $(value FOO BAR)
16	echo $(value FOO,BAR)
17	echo $(value $(FOOREF))
18
19$(info $(value X))