anchor.diff:      done
     '';
   
  -  buildInputs = [curl openssl zlib expat gettext cpio makeWrapper libiconv perl]
  +  nativeBuildInputs = [ perl ];
  +  buildInputs = [curl openssl zlib expat gettext cpio makeWrapper libiconv]
  +    ++ stdenv.lib.optionals perlSupport [ perl ]
       ++ stdenv.lib.optionals withManual [ asciidoc texinfo xmlto docbook2x
            docbook_xsl docbook_xml_dtd_45 libxslt ]
       ++ stdenv.lib.optionals guiSupport [tcl tk]
  
positive.code: , darwin
  }:
  
  let
    version = "2.16.3";
    svn = subversionClient.override { perlBindings = true; };
  in
  
  stdenv.mkDerivation {
  
negative.code: , asciidoc, texinfo, xmlto, docbook2x, docbook_xsl, docbook_xml_dtd_45
  , libxslt, tcl, tk, makeWrapper, libiconv
  , svnSupport, subversionClient, perlLibs, smtpPerlLibs
  , perlSupport ? true
  , guiSupport
  , withManual ? true
  , pythonSupport ? true
  