title: cmake include header only library
body: <p>I want to include <a href="https://github.com/gabime/spdlog" rel="nofollow">spdlog</a> into one of my project. It is a header only library. The project that i am building is using cmake. Currently i am using</p>
  
  <pre><code>include_directories('src/logger/spdlog/')
  </code></pre>
  
  <p>in cmake and including the library as</p>
  
  <pre><code>#include &lt;spdlog/spdlog.h&gt;
  </code></pre>
  
  <p>in logs.h inside logger folder. I am getting fatal error no such file or directory. What is the correct way to include the same library in my application.</p>