code: def generate(env):
      
  
      disttar_action=SCons.Action.Action(disttar, disttar_string)
      env['BUILDERS']['DistTar'] =  Builder(
              action=disttar_action
              , emitter=disttar_emitter
              , suffix = disttar_suffix
              , target_factory = env.fs.Entry
      )
  
      env.AppendUnique(
          DISTTAR_FORMAT = 'gz'
      )
docs: Add builders and construction variables for the DistTar builder.