title: installing libxcb - No package 'xproto' found
body: <p>I am trying to install libxcb:
  I started with xcb-proto 1.11 with:</p>
  
  <pre><code>./configure --prefix=/usr
  </code></pre>
  
  <p>Which works without errors.</p>
  
  <p>But when i try to install libXau-1.0.8 with:</p>
  
  <pre><code>./configure --prefix=/usr
  </code></pre>
  
  <p>I get the error:</p>
  
  <pre><code>checking for XAU... configure: error: Package requirements (xproto) were not met:
  
  No package 'xproto' found
  Consider adjusting the PKG_CONFIG_PATH environment variable,...
  </code></pre>
  
  <p>I am not sure if i missed some important parameter for the installation or something ?</p>