anchor.diff:  { lib
   , fetchFromGitHub
  -, python2Packages
  +, python3
   , asciidoc
   , cacert
   , docbook_xsl
  
positive.code:     sed -i docs/Makefile -e "s|a2x -v -d |a2x -L -v -d |"
  
      # Provide CA certificates (Used when "sslcacertfile = OS-DEFAULT" is configured")
      sed -i offlineimap/utils/distro.py -e '/def get_os_sslcertfile():/a\ \ \ \ return "${cacert}/etc/ssl/certs/ca-bundle.crt"'
    '';
  
    postInstall = ''
  
negative.code:     libxslt
    ];
  
    propagatedBuildInputs = with python3.pkgs; [
      certifi
      distro
      imaplib2
      kerberos
      pysocks
      rfc6555
      urllib3
    ];
  
    postPatch = ''
  