gecko-dev/media/ffvpx/INSTALL.md

#Installing FFmpeg:

1. Type ./configure to create the configuration. A list of configure options is printed by running configure --help.

   configure can be launched from a directory different from the FFmpeg sources to build the objects out of tree. To do this, use an absolute path when launching configure, e.g. /ffmpegdir/ffmpeg/configure.

2. Then type make to build FFmpeg. GNU Make 3.81 or later is required.

3. Type make install to install all binaries and libraries you built.

NOTICE

• Non system dependencies (e.g. libx264, libvpx) are disabled by default.