new_contents: import xyz
  import os
  import shutil
  
  class Mpc(xyz.BuildProtocol):
      pkg_name = 'mpc'
      deps = ['gmp', 'mpfr']
  
      def configure(self, builder, config):
          builder.host_lib_configure(config=config)
  
  rules = Mpc()
  
subject: Add support for MPC package