diff --git a/Makefile b/Makefile
index af8415e6..70431c51 100644
--- a/Makefile
+++ b/Makefile
@@ -1,48 +1,14 @@
-PLAT ?= none
-PLATS = linux freebsd macosx
+include platform.mk
 
-CC ?= gcc
-
-.PHONY : none $(PLATS) clean lua all
-
-ifneq ($(PLAT), none)
-
-.PHONY : default
-
-default :
-	$(MAKE) $(PLAT)
-
-endif
-
-none :
-	@echo "Please do 'make PLATFORM' where PLATFORM is one of these:"
-	@echo "   $(PLATS)"
-
-LUA_STATICLIB = 3rd/lua/liblua.a
+LUA_STATICLIB := 3rd/lua/liblua.a
 LUA_LIB ?= $(LUA_STATICLIB)
 LUA_INC ?= -I3rd/lua
 LUA_CLIB_PATH ?= luaclib
 CSERVICE_PATH ?= cservice
 SKYNET_BUILD_PATH ?= .
 
-
 CFLAGS = -g -Wall $(LUA_INC) $(MYCFLAGS)
 
-LIBS = -lpthread -lm
-SHARED = -fPIC --shared
-EXPORT = -Wl,-E
-
-$(PLATS) : all 
-
-linux : PLAT = linux
-macosx : PLAT = macosx
-freebsd : PLAT = freebsd
-
-macosx linux : LIBS += -ldl
-macosx : SHARED = -fPIC -dynamiclib -Wl,-undefined,dynamic_lookup
-macosx : EXPORT =
-linux freebsd : LIBS += -lrt
-
 $(LUA_STATICLIB) :
 	cd 3rd/lua && $(MAKE) CC=$(CC) $(PLAT)
 
diff --git a/platform.mk b/platform.mk
new file mode 100644
index 00000000..11031f89
--- /dev/null
+++ b/platform.mk
@@ -0,0 +1,34 @@
+PLAT ?= none
+PLATS = linux freebsd macosx
+
+CC ?= gcc
+
+.PHONY : none $(PLATS) clean all
+
+ifneq ($(PLAT), none)
+
+.PHONY : default
+
+default :
+	$(MAKE) $(PLAT)
+
+endif
+
+none :
+	@echo "Please do 'make PLATFORM' where PLATFORM is one of these:"
+	@echo "   $(PLATS)"
+
+LIBS := -lpthread -lm
+SHARED := -fPIC --shared
+EXPORT := -Wl,-E
+
+$(PLATS) : all 
+
+linux : PLAT = linux
+macosx : PLAT = macosx
+freebsd : PLAT = freebsd
+
+macosx linux : LIBS += -ldl
+macosx : SHARED := -fPIC -dynamiclib -Wl,-undefined,dynamic_lookup
+macosx : EXPORT :=
+linux freebsd : LIBS += -lrt