old_contents: class TarPackage (GnuPackage):
  	def __init__ (self):
  		GnuPackage.__init__ (self, 'tar', '1.26',
  			configure_flags = [
  				'--enable-nls=no'
  			]
  		)
  
  TarPackage ()
  
new_contents: GnuXzPackage ('tar', '1.28', configure_flags = ['--enable-nls=no'])
  
subject: Update tar to 1.28