title: cmake source directory does not exist
body: <p>I am trying to install xtl from <a href="https://github.com/QuantStack/xtl" rel="nofollow noreferrer">here</a>. I cloned this directory and unzipped it at this location : /home/usr/Downloads/xtl-master. And then in this directory, I opened up the terminal and entered this command</p>
  
  <pre><code>cmake -D CMAKE_INSTALL_PREFIX=/home/fatima/Downloads/xtl-master/CMakeLists.txt
  </code></pre>
  
  <p>And this is the error it gives me :</p>
  
  <blockquote>
    <p>CMake Error: The source directory "/home/fatima/Downloads/xtl-master/CMAKE_INSTALL_PREFIX=/home/fatima/Downloads/xtl-master" does not exist.</p>
  </blockquote>