anchor.diff:  , libxslt
   }:
   
  -python2Packages.buildPythonApplication rec {
  -  version = "7.3.4";
  +python3.pkgs.buildPythonApplication rec {
     pname = "offlineimap";
  +  version = "8.0.0";
   
     src = fetchFromGitHub {
       owner = "OfflineIMAP";
  -    repo = "offlineimap";
  +    repo = "offlineimap3";
       rev = "v${version}";
  -    sha256 = "sha256-sra2H0+5+LAIU3+uJnii+AYA05nuDyKVMW97rbaFOfI=";
  +    sha256 = "0y3giaz9i8vvczlxkbwymfkn3vi9fv599dy4pc2pn2afxsl4mg2w";
     };
   
     nativeBuildInputs = [
  
positive.code: { lib
  , fetchFromGitHub
  , python2Packages
  , asciidoc
  , cacert
  , docbook_xsl
  
negative.code:   # Test requires credentials
    doCheck = false;
  
    pythonImportsCheck = [
      "offlineimap"
    ];
  
    meta = with lib; {
      description = "Synchronize emails between two repositories, so that you can read the same mailbox from multiple computers";
      homepage = "http://offlineimap.org";
  