makefile: support building example_bass

Add the juice needed to make example_bass buildable from the Makefile.

This should be compatible with MinGW and Linux.

Makefile

@@ -7,6 +7,18 @@ CFLAGS = -g -O2 -Wall
 # user-defined config file (if available)
 -include config.mak
 
+ifdef COMSPEC
+	X = .exe
+	OPENGL_LIBS = -lopengl32 -lglu32
+	SDL_LIBS = -lSDL
+	LDLIBS += -lws2_32
+else
+	OPENGL_LIBS = -lGL -lGLU
+	SDL_CFLAGS = $(shell sdl-config --cflags)
+	SDL_LIBS = $(shell sdl-config --libs)
+	LDLIBS += -lm
+endif
+
 SYNC_OBJS = \
 	sync/data.o \
 	sync/device.o \
@@ -14,9 +26,18 @@ SYNC_OBJS = \
 
 all: lib/librocket.a
 
+bin/example_bass$X: CPPFLAGS += -Iexample_bass/include
+bin/example_bass$X: CXXFLAGS += $(SDL_CFLAGS)
+bin/example_bass$X: LDLIBS += -Lexample_bass/lib -lbass
+bin/example_bass$X: LDLIBS += $(OPENGL_LIBS) $(SDL_LIBS)
+
 clean:
-	$(RM) -rf $(SYNC_OBJS) lib
+	$(RM) -rf $(SYNC_OBJS) lib bin
 
 lib/librocket.a: $(SYNC_OBJS)
 	@mkdir -p lib
 	$(AR) $(ARFLAGS) $@ $^
+
+bin/example_bass$X: example_bass/example_bass.cpp lib/librocket.a
+	@mkdir -p bin
+	$(LINK.cpp) $^ $(LOADLIBES) $(LDLIBS) -o $@