-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) $(INCL)
+
+CONVERT = convert
+WINDRES = windres
+
+CONVERT_ICON_ARGS = -transparent black -background transparent
+
+PROGBASE = rocksndiamonds
+PROGNAME = ../$(PROGBASE)
+
+EDITION ?= default
+
+
+# -----------------------------------------------------------------------------
+# configuring platform
+# -----------------------------------------------------------------------------
+
+ifeq ($(PLATFORM),unix) # compiling on Unix/Linux (generic)
+PROFILING_FLAGS = -pg
+endif
+
+ifeq ($(PLATFORM_BASE),cross-win) # cross-compiling to Windows
+PROGNAME = ../$(PROGBASE).exe
+EXTRA_LDFLAGS = -lshfolder -lwsock32
+endif
+
+ifeq ($(PLATFORM),emscripten) # compiling with Emscripten
+PROGNAME = ../$(PROGBASE).js
+CC = emcc
+AR = emar
+RANLIB = emranlib
+STRIP = true
+endif
+
+ifdef BUILD_DIST # distribution build
+ifeq ($(shell uname -s),Darwin) # compiling on Mac OS X
+MAC_TARGET_VERSION_MIN = 10.7
+EXTRA_FLAGS_MAC = -mmacosx-version-min=$(MAC_TARGET_VERSION_MIN)
+EXTRA_CFLAGS = $(EXTRA_FLAGS_MAC)
+EXTRA_LDFLAGS = $(EXTRA_FLAGS_MAC)
+MACOSX_DEPLOYMENT_TARGET = $MAC_TARGET_VERSION_MIN
+endif
+endif
+
+
+# -----------------------------------------------------------------------------
+# configuring target
+# -----------------------------------------------------------------------------
+
+ifndef TARGET # auto-detect compiling for SDL2
+ SDL_VERSION := $(shell sdl2-config --version 2> /dev/null)
+ ifdef SDL_VERSION
+ TARGET = sdl2
+ else
+ $(error SDL2 library not found)
+ endif
+endif
+
+# $(info Using SDL version $(SDL_VERSION) [TARGET == $(TARGET)])
+
+ifeq ($(TARGET),sdl2) # compiling for SDL2 target
+ifeq ($(PLATFORM),emscripten)
+SDL_LIBS = -s USE_SDL_IMAGE=2 -s USE_SDL_MIXER=2 -s USE_SDL_NET=2 -s USE_ZLIB=1
+SDL_FMTS = -s SDL2_IMAGE_FORMATS='["bmp","png","pcx","xpm"]'
+EXTRA_CFLAGS = $(SDL_LIBS)
+EXTRA_LDFLAGS = $(SDL_FMTS) -s INITIAL_MEMORY=65536000 -s ALLOW_MEMORY_GROWTH=1 --preload-file ../graphics/ --preload-file ../sounds/ --preload-file ../levels/ --preload-file ../music/ -s NO_EXIT_RUNTIME=0 -s ASYNCIFY -O2
+else
+SDL_LIBS = -lSDL2_image -lSDL2_mixer -lSDL2_net
+endif
+
+SYS_CFLAGS := -DTARGET_SDL2 $(shell sdl2-config --cflags)
+SYS_LDFLAGS := $(SDL_LIBS) $(shell sdl2-config --libs) -lm -lz
+endif
+
+
+# -----------------------------------------------------------------------------
+# configuring compile-time definitions
+# -----------------------------------------------------------------------------
+
+ifdef RO_GAME_DIR # path to read-only game data specified
+CONFIG_RO_GAME_DIR = -DRO_GAME_DIR="\"$(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
+
+CONFIG = $(CONFIG_RO_GAME_DIR) $(CONFIG_RW_GAME_DIR) $(JOYSTICK)
+
+DEBUG = -DDEBUG -g
+
+# PROFILING = $(PROFILING_FLAGS)
+
+# OPTIONS = $(DEBUG) -Wall # only for debugging purposes
+# OPTIONS = $(DEBUG) -O2 -Wall # only for debugging purposes
+# OPTIONS = $(DEBUG) -Wall # only for debugging purposes
+OPTIONS = $(DEBUG) -Wall -Wstrict-prototypes -Wmissing-prototypes
+# OPTIONS = $(DEBUG) -Wall -ansi -pedantic # only for debugging purposes
+# OPTIONS = -O2 -Wall -ansi -pedantic
+# OPTIONS = -O2 -Wall
+# OPTIONS = -O2
+
+ifdef BUILD_DIST # distribution build
+SYS_LDFLAGS := $(shell echo $(SYS_LDFLAGS) | \
+ sed -e "s%-rpath,[^ ]*%-rpath,'\$$ORIGIN/lib'%")
+OPTIONS = -O2 -Wall
+endif
+
+CFLAGS = $(OPTIONS) $(SYS_CFLAGS) $(EXTRA_CFLAGS) $(CONFIG)
+LDFLAGS = $(SYS_LDFLAGS) $(EXTRA_LDFLAGS)
+