From ffb85d90a3c6e90cd9afe1536c45ca3bae76d274 Mon Sep 17 00:00:00 2001
From: Abhinav Shukla <abhinav280895@gmail.com>
Date: Wed, 3 Aug 2016 20:09:19 -0700
Subject: [PATCH] Update Makefile to check if libav present

---
 linux/Makefile | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/linux/Makefile b/linux/Makefile
index 3cb83cdf..1c441126 100644
--- a/linux/Makefile
+++ b/linux/Makefile
@@ -57,10 +57,16 @@ CFLAGS+= $(shell pkg-config --cflags libavcodec)
 CFLAGS+= $(shell pkg-config --cflags libavformat)
 CFLAGS+= $(shell pkg-config --cflags libavutil)
 CFLAGS+= $(shell pkg-config --cflags libswscale)
-LDFLAGS+= $(shell pkg-config --libs libavcodec )
-LDFLAGS+= $(shell pkg-config --libs libavformat )
-LDFLAGS+= $(shell pkg-config --libs libavutil )
-LDFLAGS+= $(shell pkg-config --libs libswscale )
+AV_LDFLAGS+= $(shell pkg-config --libs libavcodec )
+AV_LDFLAGS+= $(shell pkg-config --libs libavformat )
+AV_LDFLAGS+= $(shell pkg-config --libs libavutil )
+AV_LDFLAGS+= $(shell pkg-config --libs libswscale )
+ifeq ($(AV_LDFLAGS),$(EMPTY))
+$(error **ERROR** "libav not found")
+else
+$(info "libav found")
+endif
+LDFLAGS+= $(AV_LDFLAGS)
 endif
 
 ifeq ($(ENABLE_OCR),yes)