--- /usr/portage/dev-util/valgrind/valgrind-3.5.0.ebuild	2010-01-15 23:05:41.000000000 +0100
+++ /usr/local/portage/dev-util/valgrind/valgrind-3.5.0-r1.ebuild	2010-01-22 00:07:21.000000000 +0100
@@ -49,6 +49,9 @@
 	# warning about executable stacks.
 	epatch "${FILESDIR}/valgrind-3.5.0-non-exec-stack.patch"
 
+	# support the lzcnt instruction on amd64 
+	epatch "${FILESDIR}/valgrind-3.5.0-amd64-lzcnt.patch"
+
 	# Regenerate autotools files
 	eautoreconf
 }