1test1:
 2	touch -t 197101010000 foo
 3	touch bar
 4
 5# Note order-only dependency will not appear in $^
 6test2: foo | bar
 7	echo PASS_$^
 8
 9# bar is newer than foo but we should not rebuild it.
10foo: | bar baz
11
12baz:
13	touch $@