From bf3264b1971334d6c02e89ec406302a6e3ec6900 Mon Sep 17 00:00:00 2001
From: Andrey Kamaev <andrey.kamaev@itseez.com>
Date: Thu, 4 Apr 2013 11:04:51 +0400
Subject: [PATCH] Add missed CMake include for check_include_file

Issue #2820
---
 cmake/OpenCVFindLibsGrfmt.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cmake/OpenCVFindLibsGrfmt.cmake b/cmake/OpenCVFindLibsGrfmt.cmake
index 08af604ae9..33e428b7c8 100644
--- a/cmake/OpenCVFindLibsGrfmt.cmake
+++ b/cmake/OpenCVFindLibsGrfmt.cmake
@@ -116,6 +116,7 @@ if(WITH_PNG AND NOT IOS)
   else()
     include(FindPNG)
     if(PNG_FOUND)
+      include(CheckIncludeFile)
       check_include_file("${PNG_PNG_INCLUDE_DIR}/png.h"        HAVE_PNG_H)
       check_include_file("${PNG_PNG_INCLUDE_DIR}/libpng/png.h" HAVE_LIBPNG_PNG_H)
       if(HAVE_PNG_H)