# D:\Opencv_Tools\opencv\sources\3rdparty\protobuf\src\google\protobuf\stubs\io_win32.cc|94|error: 'nullptr' was not declared in this scope| edit

I am trying to build opencv-3.4.1-vc14_vc15 in my windows 10 using cmake-3.10.2-win64-x64. First of all I tried using CMake to configure and generate the new_build files(using codeblocks minGW makefile). I only checked the BUILD_opencv_world option as I saw in a tutorial. I think it did it without errors. Then I opened the OpenCV.cbp file within my codeblocks 17.02 and build it.

but I got this error:

||=== Build: all in OpenCV (compiler: GNU GCC Compiler) ===|
D:\Opencv_Tools\opencv\sources\3rdparty\libjpeg\jcmaster.c||In function 'validate_script':|
D:\Opencv_Tools\opencv\sources\3rdparty\libjpeg\jcmaster.c|456|warning: array subscript is above array bounds [-Warray-bounds]|
D:\Opencv_Tools\opencv\sources\3rdparty\libjpeg\jquant1.c||In function 'start_pass_1_quant':|
D:\Opencv_Tools\opencv\sources\3rdparty\libjpeg\jquant1.c|443|warning: array subscript is above array bounds [-Warray-bounds]|
D:\Opencv_Tools\opencv\sources\3rdparty\libwebp\src\enc\quant_enc.c||In function 'VP8SetSegmentParams':|
D:\Opencv_Tools\opencv\sources\3rdparty\libwebp\src\enc\quant_enc.c|376|warning: array subscript is above array bounds [-Warray-bounds]|
D:\Opencv_Tools\opencv\sources\3rdparty\protobuf\src\google\protobuf\stubs\io_win32.cc|94|warning: identifier 'nullptr' is a keyword in C++11 [-Wc++0x-compat]|
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