diff --git a/.hgignore b/.hgignore
new file mode 100644
index 0000000..d791833
--- /dev/null
+++ b/.hgignore
@@ -0,0 +1,6 @@
+glob:*.dep
+glob:*.o
+^ag_lua.c$
+^anaglym$
+^sdl_keymap.cc$
+^sdl_keymap.h$
diff --git a/Makefile b/Makefile
index 69019f2..df31fc0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
 
 WINCHECK := $(shell which msys-1.0.dll >/dev/null 2>&1; if [ $$? -eq 0 ]; then echo MSYS; fi)
 ifeq ($(strip $(WINCHECK)),)
-WINDOWS  := 0
+PLATFORM := PLATFORM_LINUX
 else
-WINDOWS  := 1
+PLATFORM := PLATFORM_WINDOWS
 endif
 
 TARGET   := anaglym
@@ -46,7 +46,7 @@ VORBISLIBS  := -lvorbisfile
 
 TOPLEVEL    := $(shell pwd)
 
-ifeq ($(WINDOWS),1)
+ifeq ($(PLATFORM),PLATFORM_WINDOWS)
 GLLIBS      := -lopengl32 -lglu32
 WINDOWSLIBS := -lmingw32
 TARGET      := $(TARGET).exe
@@ -55,7 +55,7 @@ else
 GLLIBS      := -lGL -lGLU
 endif
 
-export CPPFLAGS := $(LUAINCLUDE) $(SDLINCLUDE) $(ODEINCLUDE) $(FTGLINCLUDE) -I$(TOPLEVEL)
+export CPPFLAGS := $(LUAINCLUDE) $(SDLINCLUDE) $(ODEINCLUDE) $(FTGLINCLUDE) -I$(TOPLEVEL) -D$(PLATFORM)
 export CFLAGS   := $(CPPFLAGS) -O2 -Wall
 export CXXFLAGS := $(CFLAGS)
 export LDFLAGS  := $(LUALIBS) $(ODELIBS) $(GLLIBS) $(WINDOWSLIBS) $(SDLLIBS) $(FTGLLIBS) $(SMPEGLIBS) $(VORBISLIBS)
@@ -116,7 +116,7 @@ dist: all
 	svn export lib $@/lib
 	svn export doc $@/doc
 	cp $(TARGET) $@
-ifeq ($(WINDOWS),1)
+ifeq ($(PLATFORM),PLATFORM_WINDOWS)
 # copy DLLs to distribution directory
 	cp -a $(shell which SDL.dll) $@
 	cp -a $(shell which SDL_image.dll) $@