errors when installing

[adangert]

main-10-230-159-44:build aaron$ make
Scanning dependencies of target conversion
[ 5%] Building CXX object thirdparty/opencv-ndarray-conversion/CMakeFiles/conversion.dir/conversion.cpp.o
In file included from /Users/aaron/git/brisk/brisk/thirdparty/opencv-ndarray-conversion/conversion.cpp:1:
In file included from /Users/aaron/git/brisk/brisk/thirdparty/opencv-ndarray-conversion/conversion.h:5:
In file included from /usr/local/include/opencv4/opencv2/imgproc/imgproc.hpp:48:
In file included from /usr/local/include/opencv4/opencv2/imgproc.hpp:46:
In file included from /usr/local/include/opencv4/opencv2/core.hpp:52:
/usr/local/include/opencv4/opencv2/core/cvdef.h:656:4: error: "OpenCV 4.x+ requires enabled C++11 support"

error "OpenCV 4.x+ requires enabled C++11 support"

^
In file included from /Users/aaron/git/brisk/brisk/thirdparty/opencv-ndarray-conversion/conversion.cpp:1:
In file included from /Users/aaron/git/brisk/brisk/thirdparty/opencv-ndarray-conversion/conversion.h:5:
In file included from /usr/local/include/opencv4/opencv2/imgproc/imgproc.hpp:48:
In file included from /usr/local/include/opencv4/opencv2/imgproc.hpp:46:
In file included from /usr/local/include/opencv4/opencv2/core.hpp:57:
/usr/local/include/opencv4/opencv2/core/matx.hpp:143:15: error: no template named 'initializer_list' in namespace 'std'
Matx(std::initializer_list<_Tp>); //!< initialize from an initializer list
~~~~~^
/usr/local/include/opencv4/opencv2/core/matx.hpp:361:14: error: no template named 'initializer_list' in namespace 'std'
Vec(std::initializer_list<_Tp>);
~~~~~^
/usr/local/include/opencv4/opencv2/core/matx.hpp:664:28: error: no template named 'initializer_list' in namespace 'std'
Matx<_Tp, m, n>::Matx(std::initializer_list<_Tp> list)
~~~~~^
/usr/local/include/opencv4/opencv2/core/matx.hpp:1016:24: error: no template named 'initializer_list' in namespace 'std'
Vec<_Tp, cn>::Vec(std::initializer_list<_Tp> list)
~~~~~^