Fixed *.d handling, fixed sdl2 flags

Makefile

@@ -39,7 +39,11 @@ else
 	CXXFLAGS += -D NDEBUG -O3
 endif
 
-LDLIBS := -lm -lscgui -lSDL2 -lcairo -lscerror -lscstring -lscscreensaver -lscnumerics
+LDLIBS := -lm -lscgui -lcairo -lscerror -lscstring -lscscreensaver -lscnumerics
+
+LDLIBS += $(shell pkg-config sdl2 --libs)
+CXXFLAGS += $(shell pkg-config sdl2 --cflags)
+
 UNAME_S := $(shell uname -s)
 
 ifeq ($(UNAME_S),Darwin)
@@ -53,15 +57,13 @@ endif
 
 all: $(BIN) modules
 
-$(BIN): $(OBJS) $(DEPS)
+$(BIN): $(OBJS)
 	$(CXX) $(OBJS) $(LDFLAGS) $(LDLIBS) -o $(BIN)
 
-%.o: %.cpp %.d Makefile
+%.o %.d: %.cpp
 	$(CXX) $(CXXFLAGS) -MMD -MP -MT $@ -MF $*.d -c $<
 
--include *.d
-
-%.d: ;
+-include $(DEPS)
 
 new:
 	@./newmodule $(NEW_ARGS)