title: Installing php redis with igbinary, header file is not found
body: <p>I'm trying to install the phpredis extension, but no luck.</p>
  
  <p>After running the command <code>./configure --enable-redis-igbinary</code>, I've received the following error:</p>
  
  <blockquote>
    <p>checking for igbinary includes... configure: error: Cannot find igbinary.h</p>
  </blockquote>
  
  <p>igbinary was installed using PECL, but looks like the header files are not being found.</p>