--- libvpx-1.7.0/configure.orig	2018-01-25 07:25:44.000000000 +0900
+++ libvpx-1.7.0/configure	2018-05-21 22:21:02.266701000 +0900
@@ -170,7 +170,7 @@
     [ -f "${source_path}/${t}.mk" ] && enable_feature ${t}
 done
 
-if ! diff --version >/dev/null; then
+if ! hash diff 2>/dev/null; then
   die "diff missing: Try installing diffutils via your package manager."
 fi