-CC = gcc
-CPP = $(CC) -E
-# CC = cc # for HP-UX and others
-
-GAME_DIR = -DGAME_DIR=\".\" # path of the game and its data
-# JOYSTICK = -DNO_JOYSTICK # no joystick
-# SOUNDS = -DNO_SOUNDS # no sounds
-# SCORE_ENTRIES = -DONE_PER_NAME # only one score entry per name
-SCORE_ENTRIES = -DMANY_PER_NAME # many score entries per name
-
-# The XPM-Library is no longer needed to build this program,
-# but is used to load graphics if XPM_INCLUDE_FILE is defined,
-# because the GIF loading routines are still a bit beta.
-# If you use the Xpm library, convert the GIF files to Xpm
-# files (and the mask files ('*Maske.gif') to xbm files).
-
-# XPM_INCLUDE_FILE = -DXPM_INCLUDE_FILE="<X11/xpm.h>"
-
-CONFIG = $(GAME_DIR) $(SOUNDS) $(JOYSTICK) \
- $(SCORE_ENTRIES) $(XPM_INCLUDE_FILE)
-
-# DEBUG = -DDEBUG -g -ansi -pedantic -Wall
-DEBUG = -DDEBUG -g -Wall
-# DEBUG = -O6
-
-# SYSTEM = -Aa -D_HPUX_SOURCE -Dhpux # for HP-UX (obsolete)
-# SYSTEM = -DSYSV -Ae # for HP-UX
-# INCL = -I/usr/include/X11R5 # for HP-UX and others
-# INCL = -I/usr/local/X11/include # for SunOS and others
-# LIBS = -L/usr/lib/X11R5 -lXpm -lX11 -lm
-# # for HP-UX and others
-# LIBS = -L/usr/local/X11/lib -lXpm -lX11 -lm -lsocket -R/usr/local/X11/lib
-# # for SunOS and others
-
-# LIBS = -L/usr/X11R6/lib -lXpm -lX11 -lm
-LIBS = -L/usr/X11R6/lib -lX11 -lm
-
-# CFLAGS = -O2 $(CONFIG) $(SYSTEM)
-CFLAGS = $(DEBUG) $(CONFIG) $(SYSTEM) $(INCL)
+
+PROGBASE = rocksndiamonds
+PROGNAME = ../$(PROGBASE)
+
+ifeq ($(PLATFORM),solaris)
+EXTRA_LDFLAGS = -lnsl -lsocket -R$(XLIB_PATH)
+PLATFORM = unix
+endif
+
+ifeq ($(PLATFORM),macosx)
+PLATFORM = unix
+TARGET=sdl
+endif
+
+ifeq ($(PLATFORM),unix)
+PROFILING_FLAGS = -pg
+endif
+
+ifeq ($(PLATFORM),cross-msdos)
+PROGBASE = rocks
+PROGNAME = ../$(PROGBASE).exe
+TARGET = allegro
+endif
+
+ifeq ($(PLATFORM),cross-win32)
+PROGNAME = ../$(PROGBASE).exe
+TARGET = sdl
+endif
+
+ifeq ($(TARGET),x11)
+SYS_CFLAGS = -DTARGET_X11 $(X11_INCL)
+SYS_LDFLAGS = $(X11_LIBS) -lX11
+endif
+
+ifeq ($(TARGET),sdl)
+SYS_CFLAGS = -DTARGET_SDL $(shell sdl-config --cflags)
+SYS_LDFLAGS = -lSDL_image -lSDL_mixer $(shell sdl-config --libs)
+endif
+
+ifeq ($(TARGET),allegro)
+SYS_CFLAGS = -DTARGET_ALLEGRO -I$(CROSS_PATH_MSDOS)/include
+SYS_LDFLAGS = -lalleg
+endif
+
+endif # (PLATFORM != msdos)
+
+
+ifdef RO_GAME_DIR # path to read-only game data specified
+CONFIG_RO_GAME_DIR = -DRO_GAME_DIR="\"$(RO_GAME_DIR)\""
+endif
+
+ifdef RW_GAME_DIR # path to writable game data specified
+CONFIG_RW_GAME_DIR = -DRW_GAME_DIR="\"$(RW_GAME_DIR)\""
+endif
+
+ifdef SCORE_ENTRIES # number of score entries per player specified
+CONFIG_SCORE_ENTRIES = -D$(SCORE_ENTRIES)
+endif
+
+CONFIG_GAME_DIR = $(CONFIG_RO_GAME_DIR) $(CONFIG_RW_GAME_DIR)
+
+
+CONFIG = $(CONFIG_GAME_DIR) $(CONFIG_SCORE_ENTRIES) $(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 # 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
+
+CFLAGS = $(OPTIONS) $(SYS_CFLAGS) $(CONFIG)
+LDFLAGS = $(SYS_LDFLAGS) $(EXTRA_LDFLAGS) -lm
+