+CONFIG_GAME_DIR = $(CONFIG_RO_GAME_DIR) $(CONFIG_RW_GAME_DIR)
+
+
+CONFIG = $(CONFIG_GAME_DIR) $(CONFIG_SCORE_ENTRIES) $(JOYSTICK)
+DEBUG = -DDEBUG -g
+
+OPTIONS = $(DEBUG) -Wall # only for debugging purposes
+# OPTIONS = $(DEBUG) -O3 -Wall # only for debugging purposes
+# OPTIONS = $(DEBUG) -Wall -ansi -pedantic # only for debugging purposes
+# OPTIONS = -O3 -Wall -ansi -pedantic
+# OPTIONS = -O3 -Wall
+# OPTIONS = -O3
+# OPTIONS = -DSYSV -Ae # may be needed for HP-UX
+
+CFLAGS = $(OPTIONS) $(SYS_CFLAGS) $(CONFIG)
+LDFLAGS = $(SYS_LDFLAGS) $(EXTRA_LDFLAGS) -lm