Index: /locker/sbin/build-update
===================================================================
--- /locker/sbin/build-update	(revision 745)
+++ /locker/sbin/build-update	(revision 746)
@@ -119,5 +119,8 @@
 
 [ "$found" = "yes" ] || die "error: Correct version not found."
-[ -e "$patchdir/extra/prepatch.sh" ] && (. "$patchdir/extra/prepatch.sh" || die "error: prepatch failed")
+
+if [ -e "$patchdir/extra/prepatch.sh" ]; then
+  . "$patchdir/extra/prepatch.sh" || die "error: prepatch failed"
+fi
 
 [ -s "$patchdir/oldfiles.absent" ] && (xargs -n1 test ! -e <"$patchdir/oldfiles.absent" || die "error: Conflicting files exist." )