title: How do I make sbt use the scala binaries from $SCALA_HOME directory?
body: <p>sbt downloads new version of scala compiler and the scala library for every sbt project at this location:
  ./project/boot/scala-2.8.1/lib/scala-library.jar<br>
  ./project/boot/scala-2.8.1/lib/scala-compiler.jar</p>
  
  <p>How do I make it pick up the compiler and the library from the location pointed by $SCALA_HOME?</p>
  
  <p>Also, I am surprised that it's not a common requirement. Do Scala developers prefer to use a separate copies of compiler and library for every project?</p>
  
  <p>I found the same request which was unanswered:
  <a href="http://groups.google.com/group/simple-build-tool/browse_thread/thread/9e2c7bc34253ad0f?pli=1" rel="noreferrer">http://groups.google.com/group/simple-build-tool/browse_thread/thread/9e2c7bc34253ad0f?pli=1</a></p>
  
  <p>Thanks in advance for your help.</p>