c:/Dev/ffmpeg/fate/x86_64-msvc2015/src/configure: 3149: cd: can't cd to c:/Dev/ffmpeg/fate/x86_64-msvc2015/src sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavcodec/allcodecs.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavcodec/allcodecs.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavcodec/allcodecs.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavcodec/allcodecs.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavcodec/allcodecs.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavformat/allformats.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavformat/allformats.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavdevice/alldevices.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavdevice/alldevices.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavfilter/allfilters.c: No such file or directory sed: can't read /c/Dev/ffmpeg/fate/x86_64-msvc2015/build/libavformat/protocols.c: No such file or directory cl is unable to create an executable file. If cl is a cross-compiler, use the --enable-cross-compile option. Only do this if you know what cross compiling means. C compiler test failed. If you think configure made a mistake, make sure you are using the latest version from Git. If the latest version fails, report the problem to the ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "config.log" produced by configure as this will help solve the problem.