1
 2test: foo
 3	echo $(dir foo)
 4	echo $(dir foo,bar)
 5	echo $(dir .)
 6	echo $(dir )
 7	echo $(dir src/foo.c hacks)
 8	echo $(dir hacks src/foo.c)
 9	echo $(dir /)
10	echo $(dir /foo)
11
12foo:
13	mkdir foo bar