--- a/CMakeLists.txt	2018-05-13 20:47:11.635871328 +0200
+++ b/CMakeLists.txt	2018-05-13 20:47:49.289872617 +0200
@@ -187,6 +187,7 @@
 # ----------------------------------------------------------------------------
 
 OCV_OPTION(OPENCV_ENABLE_NONFREE "Enable non-free algorithms" OFF)
+OCV_OPTION(ENABLE_DOWNLOAD "Enable download during configure" ON)
 
 # 3rd party libs
 OCV_OPTION(BUILD_ZLIB               "Build zlib from source"             WIN32 OR APPLE)

--- a/cmake/OpenCVDownload.cmake	2018-05-13 21:22:14.966943336 +0200
+++ b/cmake/OpenCVDownload.cmake	2018-05-13 21:23:15.959945424 +0200
@@ -32,6 +32,7 @@
 
 
 function(ocv_download)
+ if(ENABLE_DOWNLOAD)
   cmake_parse_arguments(DL "UNPACK;RELATIVE_URL" "FILENAME;HASH;DESTINATION_DIR;ID;STATUS" "URL" ${ARGN})
 
   macro(ocv_download_log)
@@ -236,4 +237,7 @@
   if(OCV_DOWNLOAD_HASH_NAME)
     set(${OCV_DOWNLOAD_HASH_NAME} "${DL_HASH}" CACHE INTERNAL "")
   endif()
+ else()
+  message( "Download was disabled during configure phase by ENABLE_DOWNLOAD=OFF" )
+ endif()
 endfunction()