+# -----------------------------------------------------------------------------
+# configuring target
+# -----------------------------------------------------------------------------
+
+ifeq ($(TARGET),x11) # compiling for X11 target
+SYS_CFLAGS = -DTARGET_X11 $(X11_INCL)
+SYS_LDFLAGS = $(X11_LIBS)
+endif
+
+ifeq ($(TARGET),sdl) # compiling for SDL target
+SYS_CFLAGS = -DTARGET_SDL $(shell sdl-config --cflags)
+SDL_LIBS = -lSDL_image -lSDL_mixer -lSDL_net -lsmpeg
+SYS_LDFLAGS = $(SDL_LIBS) $(shell sdl-config --libs)
+endif
+
+ifeq ($(TARGET),sdl2) # compiling for SDL2 target
+SYS_CFLAGS = -DTARGET_SDL2 $(shell sdl2-config --cflags)
+SDL_LIBS = -lSDL2_image -lSDL2_mixer -lSDL2_net -lsmpeg2
+SYS_LDFLAGS = $(SDL_LIBS) $(shell sdl2-config --libs)
+endif
+
+ifeq ($(TARGET),sdl-static) # compiling for SDL target (static)
+SYS_CFLAGS = -DTARGET_SDL $(shell sdl-config --cflags)
+SDL_LIBS = -lSDL_image -lSDL_mixer -lSDL_net -lsmpeg -lmikmod
+SYS_LDFLAGS = $(SDL_LIBS) $(shell sdl-config --static-libs)
+endif
+
+ifeq ($(TARGET),allegro) # compiling for Allegro target
+SYS_CFLAGS = -DTARGET_ALLEGRO -I$(CROSS_PATH_MSDOS)/include
+SYS_LDFLAGS = -lalleg
+endif
+
+
+# -----------------------------------------------------------------------------
+# configuring compile-time definitions
+# -----------------------------------------------------------------------------
+
+ifdef RO_GAME_DIR # path to read-only game data specified
+CONFIG_RO_GAME_DIR = -DRO_GAME_DIR="\"$(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