diff -r 5d96c022391c -r bd33e3fce750 make/linux/makefiles/defs.make
--- a/make/linux/makefiles/defs.make	Thu Dec 17 17:18:59 2015 -0800
+++ b/make/linux/makefiles/defs.make	Fri Dec 18 10:11:58 2015 -0800
@@ -99,7 +99,9 @@
 endif
 
 # PPC
-ifneq (,$(findstring $(ARCH), ppc))
+# Notice: after 8046471 ARCH will be 'ppc' for top-level ppc64 builds but
+# 'ppc64' for HotSpot-only ppc64 builds. Need to detect both variants here!
+ifneq (,$(findstring $(ARCH), ppc ppc64))
   ifeq ($(ARCH_DATA_MODEL), 64)
     MAKE_ARGS        += LP64=1
     PLATFORM         = linux-ppc64