1TRUE:=foo
 2FALSE:=
 3XY:=x 	y
 4X:=$(subst y, ,$(XY))
 5Y:=$(subst x, ,$(XY))
 6
 7$(and ${TRUE}, $(info PASS_1))
 8$(and ${FALSE}, $(info FAIL_2))
 9# Too many arguments.
10$(info $(and ${TRUE}, PASS, PASS))
11
12$(info $(and ${TRUE}, $(X)  ))
13$(info $(and ${TRUE}, $(Y)  ))
14$(and ${FALSE} , $(info FAIL_3))
15
16test:
17	echo OK