How to quickly compile FFmpeg with libx264 (x264, H.264)

1. Compile x264. See How to quickly compile libx264 for instructions.

2. Compile FFmpeg:

   cd /my/path/where/i/keep/compiled/stuff
   git clone git://source.ffmpeg.org/ffmpeg.git
   cd ffmpeg
   ./configure --enable-gpl --enable-libx264
   make
   # make install
   # ldconfig