-SYS_LDFLAGS = -lSDL_image -lSDL_mixer $(shell sdl-config --libs) -lm
-else
-SYS_CFLAGS = -DTARGET_X11 $(X11_INCL)
-SYS_LDFLAGS = $(X11_LIBS) -lX11 -lm
+SYS_LDFLAGS = -lSDL_image -lSDL_mixer $(shell sdl-config --libs)
+endif
+
+ifeq ($(TARGET),allegro)
+SYS_CFLAGS = -DTARGET_ALLEGRO -I$(CROSS_PATH_MSDOS)/include
+SYS_LDFLAGS = -lalleg