From 362914f55831f4ad3afd7c0cad8f01f2f8b4892c Mon Sep 17 00:00:00 2001
From: "Alfred E. Heggestad" <aeh@db.org>
Date: Mon, 6 Jun 2016 07:44:14 +0200
Subject: vp9: needs libvpx v1.3.0 or later

---
 mk/modules.mk     | 3 ++-
 modules/vp9/vp9.c | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/mk/modules.mk b/mk/modules.mk
index 86aa2b9..8f4f288 100644
--- a/mk/modules.mk
+++ b/mk/modules.mk
@@ -414,7 +414,8 @@ ifneq ($(USE_V4L2),)
 MODULES   += v4l2 v4l2_codec
 endif
 ifneq ($(USE_VPX),)
-MODULES   += vp8 vp9
+MODULES   += vp8
+MODULES   += $(shell pkg-config 'vpx >= 1.3.0' && echo "vp9")
 endif
 ifneq ($(USE_WINWAVE),)
 MODULES   += winwave
diff --git a/modules/vp9/vp9.c b/modules/vp9/vp9.c
index 852a19a..676d5c5 100644
--- a/modules/vp9/vp9.c
+++ b/modules/vp9/vp9.c
@@ -18,6 +18,9 @@
  * This module implements the VP9 video codec that is compatible
  * with the WebRTC standard.
  *
+ * Libvpx version 1.3.0 or later is required.
+ *
+ *
  * References:
  *
  *     http://www.webmproject.org/
-- 
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