new_contents: from spack import *
  
  class Coreutils(Package):
      """The GNU Core Utilities are the basic file, shell and text
         manipulation utilities of the GNU operating system.  These are
         the core utilities which are expected to exist on every
         operating system.
      """
      homepage = "http://www.gnu.org/software/coreutils/"
      url      = "http://ftp.gnu.org/gnu/coreutils/coreutils-8.23.tar.xz"
  
      version('8.23', 'abed135279f87ad6762ce57ff6d89c41')
  
      def install(self, spec, prefix):
          configure("--prefix=%s" % prefix)
          make()
          make("install")
  
subject: Add coreutils package.