'opencv2/nonfree/nonfree.hpp' file not found, where to find it?

[GeLink9999]

Scanning dependencies of target video_stabilization [ 33%] Building CXX object CMakeFiles/video_stabilization.dir/main.cpp.o /Users/peng/Documents/YSG/OD_dev/Real-Time-Video-Stabilization-master/main.cpp:5:10: fatal error: 'opencv2/nonfree/nonfree.hpp' file not found #include "opencv2/nonfree/nonfree.hpp" ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 error generated. make[2]: *** [CMakeFiles/video_stabilization.dir/main.cpp.o] Error 1 make[1]: *** [CMakeFiles/video_stabilization.dir/all] Error 2 make: *** [all] Error 2

[ClarkWang1214]

install opencv2.4.x, not opencv3/4