+rocks := 00 01 02 03 04 05 06 07 08 09
+rocks += 10 11 12 13 14 15 16 17 18 19
+rocks += 20 21 22 23 24 25 26 27 28 29
+rocks += 30 31 32 33 34 35 36 37 38 39
+rocks += 40 41 42 43 44 45 46 47 48 49
+rocks := $(rocks:%=data/sprites/rock%.png)
+graphics := data/sprites/ship.png data/indicators/life.png $(rocks)
+
+INSTALL := install
+INSTALL_PROGRAM := $(INSTALL) -o games -g games
+INSTALL_DATA := $(INSTALL) -m 644
+
+
+.PHONY: all clean maintainer-clean install uninstall
+.PHONY: mkinstalldirs rminstalldirs
+.PHONY: program program-clean install-program uninstall-program
+.PHONY: data data-clean install-data uninstall-data