title: include dlib in ros cmake files
body: <p>I want to use some dlib opencv headers in the pub-sub application of ros. I tried to include the dlib libraries in the ros-package cmake files as follows:</p>
  
  <p><strong>My dlib installation source path:</strong> /home/xxxx/computervision/dlib-18.18/dlib</p>
  
  <p>So I included it in cmake file of ros-pkg the following way:</p>
  
  <p>"
  set (dlib_DIR   "/home/praneeth/computervision/dlib-18.18/dlib/")
  find_package(dlib 18.18 REQUIRED)
  "
  (went through the similar way of including a opencv library inside ros-pkg cmake)</p>
  
  <p>But I am facing with the error:</p>
  
  <p>"
  Could not find a package configuration file provided by "dlib" (requested
    version 18.18) with any of the following names:</p>
  
  <pre><code>dlibConfig.cmake
  dlib-config.cmake
  </code></pre>
  
  <p>Add the installation prefix of "dlib" to CMAKE_PREFIX_PATH or set
    "dlib_DIR" to a directory containing one of the above files.  If "dlib"
    provides a separate development package or SDK, be sure it has been
    installed.
  "</p>
  
  <p>Even though the dlib folder of the above source path has <strong>dlibConfig.cmake.in</strong> file in it.</p>
  
  <p>Any help on how to include these libraries?</p>