code: def Command(self, target, source, action, **kw):
          
          bkw = {
              'action' : action,
              'target_factory' : self.fs.Entry,
              'source_factory' : self.fs.Entry,
          }
          try: bkw['source_scanner'] = kw['source_scanner']
          except KeyError: pass
          else: del kw['source_scanner']
          bld = SCons.Builder.Builder(**bkw)
          return bld(self, target, source, **kw)
docs: Builds the supplied target files from the supplied
          source files using the supplied action.  Action may
          be any type that the Builder constructor will accept
          for an action.