new_contents: import xyz
  import os
  import shutil
  
  class Sed(xyz.BuildProtocol):
      pkg_name = 'sed'
  
      def configure(self, builder, config):
          # FIXME: doen't understand --disable-shared (it isn't a lib, so not surprise ther!)
          builder.host_lib_configure(config=config)
  
  rules = Sed()
  
subject: Add (GNU) sed package