title: Apache installation; libpcre error
body: <p>When installing Apache on Ubuntu 11.10, I get the following error:</p>
  
  <blockquote>
    <p>configure: error: APR not found. Please read the documentation.</p>
  </blockquote>
  
  <p>I followed the instructions <a href="https://stackoverflow.com/questions/9436860/apache-httpd-setup-and-installation">here</a>, then, I get the error below:</p>
  
  <blockquote>
    <p>configure: error: pcre-config for libpcre not found. PCRE is required and available from <a href="http://pcre.org/" rel="noreferrer">http://pcre.org/</a></p>
  </blockquote>
  
  <p>What am I doing wrong and how can I resolve it?</p>