anchor.diff:      # The variables to substitute:
       
       inherit reposDir dbDir logDir distsDir backupsDir tmpDir
  -      urlPrefix adminAddr fsType subversion postCommitHook;
  +      urlPrefix adminAddr fsType subversion postCommitHook mailer;
       inherit (config) notificationSender userCreationDomain;
       orgUrl = config.organisation.url;
       orgLogoUrl = config.organisation.logo;
  
positive.code: 
      sendmail = "${pkgs.ssmtp}/sbin/sendmail";
      
      inherit (pkgs) libxslt enscript db4 coreutils bzip2;
  
      inherit (serverInfo) canonicalName;
  
  
negative.code:       fi
      '';
    };
  
  
    # Extract the mailer script from the Subversion source distribution.
    mailer = pkgs.runCommand "svn-mailer.py" { inherit (subversion) src; }
      ''
        unpackFile $src
        cp subversion-*/tools/hook-scripts/mailer/mailer.py $out
      '';
  
    
    # Build our custom authentication modules.
  