title: Docker : phpize cannot find config.m4
body: <p>I'm using <a href="https://github.com/LaraDock/laradock" rel="nofollow">Laradock</a> on Windows 7. I need to install bz2 extension, so I edited the php-fpm Dockerfile-70 as below.</p>
  
  <p>Added below code - </p>
  
  <pre><code>ARG INSTALL_BZ2=true
  RUN if [ ${INSTALL_BZ2} = true ]; then \
      # Install the bz2 extension
      pecl install bz2 &amp;&amp; \
      docker-php-ext-enable bz2 \
  ;fi
  </code></pre>
  
  <p>Then when I run <code>docker-compose build php-fpm</code> I get few following error. I did google search and tried suggestions, nothing so far worked.</p>
  
  <blockquote>
    <p>running: phpize</p>
    
    <p>Cannot find config.m4.</p>
    
    <p>Make sure that you run
    '/usr/local/bin/phpize' in the top level source directory of the
    module</p>
    
    <p>ERROR: `phpize' failed</p>
  </blockquote>
  
  <p>Please advice on this.</p>