title: Cmake configure fails
body: <p>When I execute</p>
  
  <pre><code>cmake -DCMAKE_INSTALL_PREFIX=$KF5 . 
  </code></pre>
  
  <p>I get this error:</p>
  
  <pre><code>Make Error at //share/cmake-3.0/Modules/CMakePackageConfigHelpers.cmake:229 (file):
    file RELATIVE_PATH must be passed a full path to the file:
  Call Stack (most recent call first):
    CMakeLists.txt:117 (configure_package_config_file)
  </code></pre>
  
  <p>Any hint?</p>