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error like this

  [ 98%] Building CXX object modules/python2/CMakeFiles/opencv_python2.dir/__/src2/cv2.cpp.o
In file included from /home/pi/opencv-3.4.1/modules/python/src2/cv2.cpp:1743:0:
/home/pi/opencv-3.4.1/release/modules/python_bindings_generator/pyopencv_generated_ns_reg.h:1689:1: error: narrowing conversion of ‘(cv::Mat::._240)4294901760u’ from ‘unsigned int’ to ‘long int’ inside { } [-Wnarrowing]
 };
 ^
/home/pi/opencv-3.4.1/release/modules/python_bindings_generator/pyopencv_generated_ns_reg.h:1689:1: error: narrowing conversion of ‘(cv::Mat::._240)4294901760u’ from ‘unsigned int’ to ‘long int’ inside { } [-Wnarrowing]
/home/pi/opencv-3.4.1/release/modules/python_bindings_generator/pyopencv_generated_ns_reg.h:1689:1: error: narrowing conversion of ‘(cv::SparseMat::._243)2147483648u’ from ‘unsigned int’ to ‘long int’ inside { } [-Wnarrowing]
/home/pi/opencv-3.4.1/release/modules/python_bindings_generator/pyopencv_generated_ns_reg.h:1689:1: error: narrowing conversion of ‘(cv::SparseMat::._243)2147483648u’ from ‘unsigned int’ to ‘long int’ inside { } [-Wnarrowing]
/home/pi/opencv-3.4.1/release/modules/python_bindings_generator/pyopencv_generated_ns_reg.h:1689:1: error: narrowing conversion of ‘(cv::UMat::._242)4294901760u’ from ‘unsigned int’ to ‘long int’ inside { } [-Wnarrowing]
/home/pi/opencv-3.4.1/release/modules/python_bindings_generator/pyopencv_generated_ns_reg.h:1689:1: error: narrowing conversion of ‘(cv::UMat::._242)4294901760u’ from ‘unsigned int’ to ‘long int’ inside { } [-Wnarrowing]
In file included from /home/pi/opencv-3.4.1/modules/python/src2/cv2.cpp:1743:0:
/home/pi/opencv-3.4.1/release/modules/python_bindings_generator/pyopencv_generated_ns_reg.h:2133:1: error: narrowing conversion of ‘(cv::ocl::Device::._265)4294967295u’ from ‘unsigned int’ to ‘long int’ inside { } [-Wnarrowing]
 };
 ^
/home/pi/opencv-3.4.1/release/modules/python_bindings_generator/pyopencv_generated_ns_reg.h:2133:1: error: narrowing conversion of ‘(cv::ocl::Device::._265)4294967295u’ from ‘unsigned int’ to ‘long int’ inside { } [-Wnarrowing]
modules/python2/CMakeFiles/opencv_python2.dir/build.make:62: recipe for target 'modules/python2/CMakeFiles/opencv_python2.dir/__/src2/cv2.cpp.o' failed
make[2]: *** [modules/python2/CMakeFiles/opencv_python2.dir/__/src2/cv2.cpp.o] Error 1
CMakeFiles/Makefile2:7836: recipe for target 'modules/python2/CMakeFiles/opencv_python2.dir/all' failed
make[1]: *** [modules/python2/CMakeFiles/opencv_python2.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2