1S:=simple 2R=recursive 3SE:= 4RE= 5 6foo=FOO 7bar= 8 9S+=$(foo) $(bar) 10R+=$(foo) $(bar) 11SE+=$(foo) $(bar) 12RE+=$(foo) $(bar) 13U+=$(foo) $(bar) 14 15bar=BAR 16 17test: 18 echo "$(S)" 19 echo "$(R)" 20 echo "$(SE)" 21 echo "$(RE)" 22 echo "$(U)" 23 echo "$(flavor S)" 24 echo "$(flavor R)" 25 echo "$(flavor SE)" 26 echo "$(flavor RE)" 27 echo "$(flavor U)" 28