old_contents: # Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
  # Spack Project Developers. See the top-level COPYRIGHT file for details.
  #
  # SPDX-License-Identifier: (Apache-2.0 OR MIT)
  
  from spack import *
  
  
  class Vt(MakefilePackage):
      """A tool set for short variant discovery in genetic sequence data."""
  
      homepage = "http://genome.sph.umich.edu/wiki/vt"
      url      = "https://github.com/atks/vt/archive/0.577.tar.gz"
  
      version('0.577',  sha256='009e2592e787ab37e471b4e8a66520141bb2791ca78142ca1767d27036f460d0')
  
      depends_on('zlib')
  
      def install(self, spec, spack):
          mkdirp(prefix.bin)
          install('vt', prefix.bin)
  
new_contents: # Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
  # Spack Project Developers. See the top-level COPYRIGHT file for details.
  #
  # SPDX-License-Identifier: (Apache-2.0 OR MIT)
  
  from spack import *
  
  
  class Vt(MakefilePackage):
      """A tool set for short variant discovery in genetic sequence data."""
  
      homepage = "http://genome.sph.umich.edu/wiki/vt"
      url      = "https://github.com/atks/vt/archive/0.577.tar.gz"
  
      version('0.5772',  sha256='b147520478a2f7c536524511e48133d0360e88282c7159821813738ccbda97e7')
      version('0.577',  sha256='009e2592e787ab37e471b4e8a66520141bb2791ca78142ca1767d27036f460d0')
  
      depends_on('zlib')
  
      def install(self, spec, spack):
          mkdirp(prefix.bin)
          install('vt', prefix.bin)
  
subject: add version 0.5772 (#13367)