+ifeq ($(TARGET),allegro)
+SYS_CFLAGS = -DTARGET_ALLEGRO -I$(CROSS_PATH_MSDOS)/include
+SYS_LDFLAGS = -lalleg
+endif
+
+endif # (PLATFORM != msdos)
+
+
+ifdef RO_GAME_DIR # path to read-only game data specified
+CONFIG_RO_GAME_DIR = -DRO_GAME_DIR="\"$(RO_GAME_DIR)\""
+endif
+
+ifdef RW_GAME_DIR # path to writable game data specified
+CONFIG_RW_GAME_DIR = -DRW_GAME_DIR="\"$(RW_GAME_DIR)\""
+endif
+
+ifdef SCORE_ENTRIES # number of score entries per player specified