Fix Makefile (now works)

Makefile

@@ -1,10 +1,16 @@
-objects = build/src/Backends/Rendering/Software.o build/src/Backends/Audio/SoftwareMixer.o build/src/Backends/Audio/SoftwareMixer/Mixer.o build/src/Backends/Platform/X11.o build/src/Backends/Controller/Null.o build/src/Backends/Rendering/Window/Software/X11.o build/src/Backends/Audio/SoftwareMixer/Solaris.o build/src/ArmsItem.o build/src/Back.o build/src/Bitmap.o build/src/Boss.o build/src/BossAlmo1.o build/src/BossAlmo2.o build/src/BossBallos.o build/src/BossFrog.o build/src/BossIronH.o build/src/BossLife.o build/src/BossOhm.o build/src/BossPress.o build/src/BossTwinD.o build/src/BossX.o build/src/BulHit.o build/src/Bullet.o build/src/Caret.o build/src/Config.o build/src/Draw.o build/src/Ending.o build/src/Escape.o build/src/Fade.o build/src/File.o build/src/Flags.o build/src/Flash.o build/src/Font.o build/src/Frame.o build/src/Game.o build/src/Generic.o build/src/GenericLoad.o build/src/Input.o build/src/KeyControl.o build/src/Main.o build/src/Map.o build/src/MapName.o build/src/MiniMap.o build/src/MyChar.o build/src/MycHit.o build/src/MycParam.o build/src/NpChar.o build/src/NpcAct000.o build/src/NpcAct020.o build/src/NpcAct040.o build/src/NpcAct060.o build/src/NpcAct080.o build/src/NpcAct100.o build/src/NpcAct120.o build/src/NpcAct140.o build/src/NpcAct160.o build/src/NpcAct180.o build/src/NpcAct200.o build/src/NpcAct220.o build/src/NpcAct240.o build/src/NpcAct260.o build/src/NpcAct280.o build/src/NpcAct300.o build/src/NpcAct320.o build/src/NpcAct340.o build/src/NpcHit.o build/src/NpcTbl.o build/src/Organya.o build/src/PixTone.o build/src/Profile.o build/src/Random.o build/src/Resource.o build/src/SelStage.o build/src/Shoot.o build/src/Sound.o build/src/Stage.o build/src/Star.o build/src/TextScr.o build/src/Triangle.o build/src/ValueView.o
+BUILD_DIR := ./build
+CFLAGS := -O2
+LDFLAGS := -lX11 -lXext -lm
+
+SRCS = src/Backends/Rendering/Software.cpp src/Backends/Audio/SoftwareMixer.cpp src/Backends/Audio/SoftwareMixer/Mixer.cpp src/Backends/Platform/X11.cpp src/Backends/Controller/Null.cpp src/Backends/Rendering/Window/Software/X11.cpp src/Backends/Audio/SoftwareMixer/Solaris.cpp src/ArmsItem.cpp src/Back.cpp src/Bitmap.cpp src/Boss.cpp src/BossAlmo1.cpp src/BossAlmo2.cpp src/BossBallos.cpp src/BossFrog.cpp src/BossIronH.cpp src/BossLife.cpp src/BossOhm.cpp src/BossPress.cpp src/BossTwinD.cpp src/BossX.cpp src/BulHit.cpp src/Bullet.cpp src/Caret.cpp src/Config.cpp src/Draw.cpp src/Ending.cpp src/Escape.cpp src/Fade.cpp src/File.cpp src/Flags.cpp src/Flash.cpp src/Font.cpp src/Frame.cpp src/Game.cpp src/Generic.cpp src/GenericLoad.cpp src/Input.cpp src/KeyControl.cpp src/Main.cpp src/Map.cpp src/MapName.cpp src/MiniMap.cpp src/MyChar.cpp src/MycHit.cpp src/MycParam.cpp src/NpChar.cpp src/NpcAct000.cpp src/NpcAct020.cpp src/NpcAct040.cpp src/NpcAct060.cpp src/NpcAct080.cpp src/NpcAct100.cpp src/NpcAct120.cpp src/NpcAct140.cpp src/NpcAct160.cpp src/NpcAct180.cpp src/NpcAct200.cpp src/NpcAct220.cpp src/NpcAct240.cpp src/NpcAct260.cpp src/NpcAct280.cpp src/NpcAct300.cpp src/NpcAct320.cpp src/NpcAct340.cpp src/NpcHit.cpp src/NpcTbl.cpp src/Organya.cpp src/PixTone.cpp src/Profile.cpp src/Random.cpp src/Resource.cpp src/SelStage.cpp src/Shoot.cpp src/Sound.cpp src/Stage.cpp src/Star.cpp src/TextScr.cpp src/Triangle.cpp src/ValueView.cpp
+
+OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
 
 all: CSE2
-optlevel = -O2
 
-%.o: %.cpp
+$(BUILD_DIR)/%.cpp.o: %.cpp
-	g++ $(optlevel) -c $< -o $@ -I./fakes/
+	mkdir -p $(dir $@)
+	g++ $(CFLAGS) -c $< -o $@ -I./fakes/
 
-CSE2: $(objects)
+CSE2: $(OBJS)
-	g++ $(optlevel) -o $@ $^ -lX11 -lXext -lm
+	g++ $(CFLAGS) -o $@ $(OBJS) $(LDFLAGS)