title: CMake Find.Boost not taking configuration in account
body: <p>When trying to compile with boost, everything goes right with Windows, but when I try to compile with Linux, it seems that the configuration given with <code>SET</code> command are not take in account by FindBoost.</p>
  <p>When doing the following,</p>
  <pre><code>set(Boost_USE_STATIC_LIBS        OFF)
  set(Boost_USE_MULTITHREADED      OFF)
  
  find_package(Boost COMPONENTS system REQUIRED)
  if (Boost_FOUND)
  MESSAGE(${Boost_SYSTEM_LIBRARY})
  endif ()
  </code></pre>
  <p>the output is <code>/usr/lib/libboost_system-mt.a</code> which seems to be the static and multithreaded version off the library. What am I doing wrong?</p>