--- old/make/aix/makefiles/defs.make	2014-06-10 22:40:30.958223003 -0700
+++ new/make/aix/makefiles/defs.make	2014-06-10 22:40:30.886223909 -0700
@@ -45,19 +45,15 @@
 endif
 
 # PPC
-ifeq ($(ARCH), ppc)
-  #ARCH_DATA_MODEL = 32
-  PLATFORM         = aix-ppc
-  VM_PLATFORM      = aix_ppc
-  HS_ARCH          = ppc
-endif
-
-# PPC64
-ifeq ($(ARCH), ppc64)
-  #ARCH_DATA_MODEL = 64
-  MAKE_ARGS       += LP64=1
-  PLATFORM         = aix-ppc64
-  VM_PLATFORM      = aix_ppc64
+ifneq (,$(findstring $(ARCH), ppc))
+  if ($(ARCH_DATA_MODEL),64)
+    MAKE_ARGS       += LP64=1
+    PLATFORM         = aix-ppc64
+    VM_PLATFORM      = aix_ppc64
+  else
+    PLATFORM         = aix-ppc
+    VM_PLATFORM      = aix_ppc
+  endif
   HS_ARCH          = ppc
 endif