From fe740316af970f57ec511cdeafb512510e4842a9 Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Sat, 9 Nov 2019 17:21:13 +0100
Subject: [PATCH] CMakeLists.txt: add BUILD_OPENCV option

Add BUILD_OPENCV option to allow the user to disable OpenCV. It is
especially useful as opencv library can be built without highgui support

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Upstream status: https://github.com/glassechidna/zxing-cpp/pull/90]
---
 CMakeLists.txt | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 738f4e1..12913cd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 3.0)
 project(zxing)
 
 option(BUILD_TESTING "Enable generation of test targets" OFF)
+option(BUILD_OPENCV "Enable OpenCV classes and OpenCV cli executable" ON)
 
 set(CMAKE_LIBRARY_PATH /opt/local/lib ${CMAKE_LIBRARY_PATH})
 
@@ -44,8 +45,10 @@ else()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 endif()
 
-# OpenCV classes
-find_package(OpenCV)
+if (BUILD_OPENCV)
+    # OpenCV classes
+    find_package(OpenCV)
+endif()
 if(OpenCV_FOUND)
     list(APPEND LIBZXING_FILES
         opencv/src/zxing/MatSource.cpp