build for Mac 10.8; make clean; notes in README

.gitignore

@@ -3,3 +3,4 @@ c_src/env.mk
 ebin
 examples/*/*.beam
 priv
+.DS_Store

Makefile

@@ -19,3 +19,14 @@ all:
 	cd c_src && make
 	erlc -o examples/bullet_engine examples/bullet_engine/*.erl
 	cd examples/bullet_engine && ./start.sh
+
+hello:
+	erlc -o examples/hello_sdl examples/hello_sdl/*.erl
+	cd examples/hello_sdl && ./start.sh
+
+clean:
+	@rm -f *.swp
+	@rm -f c_src/env.mk
+	@rm -rf ebin/
+	@rm -f examples/*/*.beam
+	@echo clean

README.md

@@ -1,19 +1,29 @@
 ESDL2
 =====
 
-SDL2 Erlang NIF.
+SDL2 Erlang NIFs
+
+SDL provides cross-platform low level access to graphics, audio, keyboard, mouseand joystick hardware via OpenGL and Direct3D. This is an Erlang binding. http://www.libsdl.org/
 
 Status
 ------
 
 Week-end project. Work in progress.
-
-The following limitations apply:
-
+
+ Building
+ --------
+
  *  Erlang 17.0+ is required
- *  SDL 2.0.3+ is required
+ *  SDL 2.0.3+ is required (`http://www.libsdl.org/download-2.0.php`)
+ *  SDL\_image is required (`https://www.libsdl.org/projects/SDL_image/`)
  *  No support for UTF-8 strings, only Latin-1
 
+Tip: configure SDL\_image with --disable-webp for not having to install libwebp.
+
+Build using `make`.
+
+Ideas
+-----
 The following ideas need to be investigated:
 
  *  We may benefit from the reference receive optimization when doing calls

c_src/Makefile

@@ -20,7 +20,8 @@ SDL2_LIBS = $(filter-out $(SDL2_LIBS_FILTER_OUT),$(shell sdl2-config --static-li
 
 all: env.mk
 	mkdir -p $(PRIV_DIR)
-	gcc *.c -fPIC -shared -o $(PRIV_DIR)/esdl2.so -I $(ERTS_INCLUDE_DIR) \
+	gcc -undefined dynamic_lookup *.c -fPIC -shared \
+		-o $(PRIV_DIR)/esdl2.so -I $(ERTS_INCLUDE_DIR) \
 		`sdl2-config --cflags` $(SDL2_LIBS) -lSDL2_image
 
 env.mk: