From cf2109e016c24ea161b923cf99e6993ea0fb9ce6 Mon Sep 17 00:00:00 2001
From: Joao Carreira <jfmcarreira@gmail.com>
Date: Wed, 3 Apr 2019 21:45:45 +0100
Subject: [PATCH] Change opencv to optional

---
 CMakeLists.txt | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7fd71ff..09fb7de 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -104,10 +104,18 @@ ENDIF()
 
 OPTION( USE_OPENCV "Add OpenCV support" ON )
 IF( USE_OPENCV )
-  LIST(APPEND OPENCV_MODULES core highgui imgproc video videoio )
-  FIND_PACKAGE( OpenCV REQUIRED core highgui imgproc video )
-  FIND_PACKAGE( OpenCV COMPONENTS videoio )
-  SET(USE_OPENCV ${OpenCV_FOUND})
+
+  FIND_PACKAGE( OpenCV COMPONENTS core highgui imgproc video )
+  IF( ${OpenCV_FOUND} )
+    SET(USE_OPENCV TRUE )
+    LIST(APPEND OPENCV_MODULES core highgui imgproc video )
+    FIND_PACKAGE( OpenCV COMPONENTS videoio )
+    IF( ${OPENCV_VIDEOIO_FOUND} )
+      LIST(APPEND OPENCV_MODULES videoio )
+    ENDIF()
+  ELSE()
+    SET(USE_OPENCV FALSE )
+  ENDIF()
 ENDIF()
 SET_PACKAGE_PROPERTIES(OpenCV PROPERTIES URL "http://opencv.willowgarage.com" DESCRIPTION "OpenCV library support in CalypFrame" TYPE OPTIONAL)