+ifdef RW_GAME_DIR # path to writable game data specified
+CONFIG_RW_GAME_DIR = -DRW_GAME_DIR="\"$(RW_GAME_DIR)\""
+endif
+
+ifdef SCORE_ENTRIES # number of score entries per player specified
+CONFIG_SCORE_ENTRIES = -D$(SCORE_ENTRIES)
+endif
+
+CONFIG_GAME_DIR = $(CONFIG_RO_GAME_DIR) $(CONFIG_RW_GAME_DIR)
+
+
+CONFIG = $(CONFIG_GAME_DIR) $(CONFIG_SCORE_ENTRIES) $(SOUNDS) $(JOYSTICK)
+
+# OPTIONS = -DDEBUG -g -Wall -ansi -pedantic # only for debugging purposes
+OPTIONS = -DDEBUG -g -Wall # only for debugging purposes
+# OPTIONS = -O3 -Wall -ansi -pedantic
+# OPTIONS = -O3 -Wall
+# OPTIONS = -O3
+
+# SYSTEM = -DSYSV -Ae # may be needed for HP-UX
+
+CFLAGS = $(OPTIONS) $(SDL_CFLAGS) $(SYSTEM) $(INCL) $(CONFIG)