frei0r error

ffmpeg -y -i wild_at_the_wheel_short.mpeg -vf 'frei0r=perspective:0.2/0.2:0.8/0.2' out.y4m
ffmpeg version git-N-29499-g500bf39, Copyright (c) 2000-2011 the FFmpeg developers
  built on Apr 29 2011 17:58:29 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  configuration: --enable-libopenjpeg --enable-gpl --enable-libfreetype --enable-frei0r --enable-libx264 --enable-shared
  libavutil    51.  1. 0 / 51.  1. 0
  libavcodec   53.  1. 1 / 53.  1. 1
  libavformat  53.  0. 3 / 53.  0. 3
  libavdevice  53.  0. 0 / 53.  0. 0
  libavfilter   2.  1. 0 /  2.  1. 0
  libswscale    0. 14. 0 /  0. 14. 0
[mp2 @ 0x101031000] Header missing
Input #0, mpeg, from 'wild_at_the_wheel_short.mpeg':
  Duration: 00:00:07.61, start: 939.741367, bitrate: 50221 kb/s
    Stream #0.0[0x1e0]: Video: mpeg2video (4:2:2), yuv422p, 720x480 [PAR 8:9 DAR 4:3], 50000 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
[buffer @ 0x100f01a20] w:720 h:480 pixfmt:yuv422p
[frei0r @ 0x100f020a0] Could not find module 'perspective'
Error initializing filter 'frei0r' with args 'perspective:0.2/0.2:0.8/0.2'
Error opening filters!