--- a/m4/summary.m4
+++ b/m4/summary.m4
@@ -83,6 +83,7 @@
     test x"$have_theora" = x"yes"      && echo "   - theora"
     test x"$have_w32dll" = x"yes"      && echo "   - w32dll"
     test x"$have_vdpau" = x"yes"       && echo "   - vdpau"
+    test x"$have_vpx" = x"yes"         && echo "   - libvpx (VP8/VP9)"
     if test x"$with_external_ffmpeg" != x"no"; then
         echo "   - ffmpeg (external library)"
     else