anchor.diff:  , fetchurl
   , python
   , pkgconfig
  +, bison
  +, flex
   , perl
   , libxslt
   , docbook_xsl
   , rpcgen
   , fixDarwinDylibNames
  -, docbook_xml_dtd_42
  +, docbook_xml_dtd_45
   , readline
   , popt
   , libbsd
  
positive.code:     libunwind
      krb5Full
      gnutls
    ] ++ optionals stdenv.isLinux [ liburing systemd ]
      ++ optional enableLDAP openldap
      ++ optional (enablePrinting && stdenv.isLinux) cups
  
negative.code: 
    nativeBuildInputs = [
      pkgconfig
      bison
      flex
      perl
      perl.pkgs.ParseYapp
      libxslt
      docbook_xsl
      docbook_xml_dtd_45
      cmocka
    ] ++ optionals stdenv.isDarwin [
      rpcgen
      fixDarwinDylibNames
  