+CONFIG = $(CONFIG_GAME_DIR) $(CONFIG_SCORE_ENTRIES) $(JOYSTICK)
+DEBUG = -DDEBUG -g
+# PROFILING = $(PROFILING_FLAGS)
+
+# 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
+
+ifdef BUILD_DIST # distribution build
+OPTIONS = -O3 -Wall
+endif