--- libxml-1.8.17/config.guess	2002-01-23 22:49:14.000000000 +0000
+++ libxml-1.8.17/config.guess	2008-05-21 10:53:14.000000000 +0100
@@ -811,6 +811,9 @@
 	rm -f $dummy.c $dummy
 	echo powerpc-unknown-linux-gnu${LIBC}
 	exit 0 ;;
+    ppc64:Linux:*:*)
+	echo powerpc64-unknown-linux-gnu
+	exit ;;
     alpha:Linux:*:*)
 	cat <<EOF >$dummy.s
 	  .data
--- libxml-1.8.17/config.sub	2002-01-23 22:49:14.000000000 +0000
+++ libxml-1.8.17/config.sub	2008-05-21 11:25:57.000000000 +0100
@@ -721,6 +721,10 @@
 	        ;;
 	ppc-*)	basic_machine=powerpc-`echo $basic_machine | sed 's/^[^-]*-//'`
 		;;
+	ppc64)  basic_machine=powerpc64-unknown
+		;;
+	ppc64-*) basic_machine=powerpc64-`echo $basic_machine | sed 's/^[^-]*-//'`
+		;;
 	ppcle | powerpclittle | ppc-le | powerpc-little)
 		basic_machine=powerpcle-unknown
 	        ;;