title: How can LD_LIBRARY_PATH be changed within CMake?
body: <p>I have a local shared library which is not in $LD_LIBRARY_PATH.
  I want to run my executable, but since it cannot find the shared library in the system folders, it outputs "error while loading shared libraries".</p>
  
  <p>A possible fix for this is to export a new LD_LIBRARY_PATH containing the local library folder.</p>
  
  <p>How can I export automatically this environment variable within CMake?</p>