--- a/hotspot/make/defs.make	Thu Mar 12 16:10:58 2015 +0100
+++ b/hotspot/make/defs.make	Thu Mar 12 15:51:12 2015 -0700
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2006, 2015, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -286,7 +286,7 @@
 
   # Use uname output for SRCARCH, but deal with platform differences. If ARCH
   # is not explicitly listed below, it is treated as x86.
-  SRCARCH     = $(ARCH/$(filter sparc sparc64 ia64 amd64 x86_64 arm ppc ppc64 aarch64 zero,$(ARCH)))
+  SRCARCH    ?= $(ARCH/$(filter sparc sparc64 ia64 amd64 x86_64 ppc ppc64 aarch64 zero,$(ARCH)))
   ARCH/       = x86
   ARCH/sparc  = sparc
   ARCH/sparc64= sparc
@@ -295,12 +295,11 @@
   ARCH/x86_64 = x86
   ARCH/ppc64  = ppc
   ARCH/ppc    = ppc
-  ARCH/arm    = arm
   ARCH/aarch64= aarch64
   ARCH/zero   = zero
 
   # BUILDARCH is usually the same as SRCARCH, except for sparcv9
-  BUILDARCH = $(SRCARCH)
+  BUILDARCH ?= $(SRCARCH)
   ifeq ($(BUILDARCH), x86)
     ifdef LP64
       BUILDARCH = amd64
@@ -320,7 +319,7 @@
   endif
 
   # LIBARCH is 1:1 mapping from BUILDARCH
-  LIBARCH         = $(LIBARCH/$(BUILDARCH))
+  LIBARCH        ?= $(LIBARCH/$(BUILDARCH))
   LIBARCH/i486    = i386
   LIBARCH/amd64   = amd64
   LIBARCH/sparc   = sparc
@@ -328,8 +327,6 @@
   LIBARCH/ia64    = ia64
   LIBARCH/ppc64   = ppc64
   LIBARCH/aarch64 = aarch64
-  LIBARCH/ppc     = ppc
-  LIBARCH/arm     = arm
   LIBARCH/zero    = $(ZERO_LIBARCH)
 
   LP64_ARCH = sparcv9 amd64 ia64 ppc64 aarch64 zero