title: How do I force bjam in boost to build cleanly and consistently?
body: <p>Is there any way to get bjam to build cleanly and consistently?  It seems fairly random when it decides to rebuild my libraries and when it decides to simply copy them over from somewhere.</p>
  
  <p>I've tried <code>bjam --clean-all</code> and <code>bjam --clean</code>, but it still seems to find the files it needs and instead of recompiling it simply copies them to my <code>stage/lib</code> folder.</p>