From e7b54ce8e909c221b2496e33a6f57320cdde30fd Mon Sep 17 00:00:00 2001
From: Vladislav Sovrasov <sovrasov.vlad@gmail.com>
Date: Thu, 24 Aug 2017 15:49:25 +0300
Subject: [PATCH] dnn_modern: disable module if protobuf compiler not found

---
 modules/dnn_modern/CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/dnn_modern/CMakeLists.txt b/modules/dnn_modern/CMakeLists.txt
index 1b8efd929..49afa0ad3 100644
--- a/modules/dnn_modern/CMakeLists.txt
+++ b/modules/dnn_modern/CMakeLists.txt
@@ -81,6 +81,12 @@ add_definitions(-DCNN_NO_SERIALIZATION -DCNN_USE_CAFFE_CONVERTER)
 #       this is not needed anymore.
 find_package(Protobuf QUIET)
 
+if(NOT ${Protobuf_FOUND})
+  message(STATUS "Module opencv_dnn_modern disabled because Protobuf is not found")
+  ocv_module_disable(dnn_modern)
+  return()
+endif()
+
 if(DEFINED PROTOBUF_PROTOC_EXECUTABLE AND EXISTS ${PROTOBUF_PROTOC_EXECUTABLE})
   execute_process(COMMAND ${PROTOBUF_PROTOC_EXECUTABLE} caffe.proto --cpp_out=./
                   WORKING_DIRECTORY ${TINYDNN_INCLUDE_DIRS}/tiny_dnn/io/caffe)