title: ERROR: SvtAv1Enc not found using pkg-config
body: <p>I am trying to compile FFmpeg with SVT-AV1 codec, following instructions from here: <a href="https://github.com/OpenVisualCloud/SVT-AV1/tree/master/ffmpeg_plugin" rel="nofollow noreferrer">https://github.com/OpenVisualCloud/SVT-AV1/tree/master/ffmpeg_plugin</a></p>
  
  <p>Everything goes well, but when I try to run</p>
  
  <pre><code>./configure --enable-libsvtav1
  </code></pre>
  
  <p>I am getting </p>
  
  <pre><code>ERROR: SvtAv1Enc not found using pkg-config
  
  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 "ffbuild/config.log" produced by configure as this will help
  solve the problem.
  </code></pre>
  
  <p>The content of the ffbuild/config.log: <a href="https://pastebin.com/euPriFAp" rel="nofollow noreferrer">https://pastebin.com/euPriFAp</a></p>
  
  <p>There is an exact issue on the github: <a href="https://github.com/OpenVisualCloud/SVT-AV1/issues/35" rel="nofollow noreferrer">https://github.com/OpenVisualCloud/SVT-AV1/issues/35</a>, but is closed as solved.</p>
  
  <p>I have tried both on my Mac and in the Docker container with Ubuntu 18.04, but getting the same result.</p>
  
  <p>Could anyone please help, what am I doing wrong?</p>