From 5c7c80dd27abb24051097653823f7b8f22d8ac33 Mon Sep 17 00:00:00 2001
From: Xiping Yan <xiping.yan@intel.com>
Date: Fri, 10 Apr 2020 20:23:13 +0800
Subject: [PATCH] Merge pull request #17028 from xipingyan:patch-1

* Update OpenCVFindVA_INTEL.cmake

When set env VA_INTEL_IOCL_ROOT, "if($ENV{VA_INTEL_IOCL_ROOT})" don't work.
    My modification as follow.

    -    if($ENV{VA_INTEL_IOCL_ROOT})
    +    if(DEFINED ENV{VA_INTEL_IOCL_ROOT})

    Refer: https://cmake.org/cmake/help/latest/variable/ENV.html

* based on merge comment, update code
---
 cmake/OpenCVFindVA_INTEL.cmake | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/cmake/OpenCVFindVA_INTEL.cmake b/cmake/OpenCVFindVA_INTEL.cmake
index 63d0f15a36..fcee37eb89 100644
--- a/cmake/OpenCVFindVA_INTEL.cmake
+++ b/cmake/OpenCVFindVA_INTEL.cmake
@@ -5,10 +5,9 @@
 # VA_INTEL_IOCL_ROOT - root of Intel OCL installation
 
 if(UNIX AND NOT ANDROID)
-    if($ENV{VA_INTEL_IOCL_ROOT})
-        set(VA_INTEL_IOCL_ROOT $ENV{VA_INTEL_IOCL_ROOT})
-    else()
-        set(VA_INTEL_IOCL_ROOT "/opt/intel/opencl")
+    ocv_check_environment_variables(VA_INTEL_IOCL_ROOT)
+    if(NOT DEFINED VA_INTEL_IOCL_ROOT)
+      set(VA_INTEL_IOCL_ROOT "/opt/intel/opencl")
     endif()
 
     find_path(