[root@derpstation ~]# ffmpeg -encoders | grep libx264
ffmpeg version git-2014-04-24-ca9cc6f Copyright (c) 2000-2014 the FFmpeg developers
  built on Apr 24 2014 13:35:52 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
  configuration:
  libavutil      52. 78.100 / 52. 78.100
  libavcodec     55. 59.100 / 55. 59.100
  libavformat    55. 37.101 / 55. 37.101
  libavdevice    55. 13.100 / 55. 13.100
  libavfilter     4.  4.100 /  4.  4.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
[root@derpstation ~]#