diff --git a/core/combo/HOST_darwin-x86.mk b/core/combo/HOST_darwin-x86.mk
index 5ab2c0d..8be6a42 100644
--- a/core/combo/HOST_darwin-x86.mk
+++ b/core/combo/HOST_darwin-x86.mk
@@ -23,6 +23,7 @@
 HOST_GLOBAL_CFLAGS += -m32
 HOST_GLOBAL_LDFLAGS += -m32
 
+build_mac_version := $(shell sw_vers -productVersion)
 mac_sdk_version := 10.6
 mac_sdk_root := /Developer/SDKs/MacOSX$(mac_sdk_version).sdk
 ifeq ($(wildcard $(mac_sdk_root)),)