Index: defaults/amd64/Makefile.config
===================================================================
--- defaults/amd64/Makefile.config	(revision ca2815eb035910c0bb4c6f348ec29513bde33098)
+++ defaults/amd64/Makefile.config	(revision fb48a0e907656015204723ad5eead3719f29242e)
@@ -67,2 +67,5 @@
 # OHCI root hub power switch, ganged is enough
 OHCI_POWER_SWITCH = ganged
+
+# GRUB boot loader architecture
+GRUB_ARCH = pc
Index: defaults/ia32/Makefile.config
===================================================================
--- defaults/ia32/Makefile.config	(revision ca2815eb035910c0bb4c6f348ec29513bde33098)
+++ defaults/ia32/Makefile.config	(revision fb48a0e907656015204723ad5eead3719f29242e)
@@ -73,2 +73,5 @@
 # OHCI root hub power switch, ganged is enough
 OHCI_POWER_SWITCH = ganged
+
+# GRUB boot loader architecture
+GRUB_ARCH = pc