I am seeing the following error when trying to build the core with no changes, just following the instructions on the website. It fails at this point but the /opencv-3.1.0/build/Debug/modules/videoo directory does not exist. I’ve scanned the complete directory and found no reference to this directory in any of the files.

1> [ 67%] Generating opencv_test_videoio_pch_dephelp.cxx
1> Scanning dependencies of target opencv_test_videoio_pch_dephelp
1> [ 67%] Building CXX object modules/videoio/CMakeFiles/opencv_test_videoio_pch_dephelp.dir/opencv_test_videoio_pch_dephelp.cxx.o
1> [ 68%] Linking CXX static library ../../lib/libopencv_test_videoio_pch_dephelp.a
1> [ 68%] Built target opencv_test_videoio_pch_dephelp
1> Scanning dependencies of target pch_Generate_opencv_test_videoio
1> [ 68%] Generating test_precomp.hpp
1> [ 68%] Generating test_precomp.hpp.gch/opencv_test_videoio_DEBUG.gch
1>arm-linux-gnueabihf-g++.exe : error : C:/Tools/VisualGDBSource/opencv-3.1.0/build/Debug/modules/videoo/test_precomp.hpp: No such file or directory
1>arm-linux-gnueabihf-g++.exe : warning : '-x c++-header' after last input file has no effect
1>arm-linux-gnueabihf-g++.exe : fatal error : no input files
1> compilation terminated.
1> make[2]: *** [modules/videoio/test_precomp.hpp.gch/opencv_test_videoio_DEBUG.gch] Error 4
1> make[1]: *** [modules/videoio/CMakeFiles/pch_Generate_opencv_test_videoio.dir/all] Error 2
1> make: *** [all] Error 2