+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
+# -----------------------------------------------------------------------------