--- a/jdk/make/common/shared/Defs-versions.gmk	Tue Mar 06 10:25:45 2012 +0800
+++ b/jdk/make/common/shared/Defs-versions.gmk	Tue Mar 06 20:34:38 2012 +0000
@@ -44,6 +44,11 @@
   override CC_VERSION = gcc
 endif
 
+# Mac OS X uses LLVM by default
+ifeq ($(PLATFORM), macosx)
+  override CC_VERSION = llvm
+endif
+
 ##########################################################################
 #
 # List of JDK official minimum, expected, or required versions:
@@ -164,6 +169,17 @@
   endif
 endif
 
+# Mac specific
+ifeq ($(PLATFORM), macosx)
+  REQUIRED_OS_NAME            = Darwin
+  REQUIRED_OS_VERSION         = 11.2
+  REQUIRED_OS_VARIANT_NAME    = MacOSX
+  REQUIRED_OS_VARIANT_VERSION = 10.7.2
+  REQUIRED_COMPILER_NAME      = GCC4
+  REQUIRED_COMPILER_VERSION   = GCC4
+  REQUIRED_CC_VER             = 4.2.1
+endif
+
 # Windows specific
 ifeq ($(PLATFORM), windows)
   REQUIRED_OS_NAME            = Windows