anchor.diff:  
   let
     name = "ikiwiki";
  -  version = "3.20100704";
  +  version = "3.20110707";
   in
   stdenv.mkDerivation {
     name = "${name}-${version}";
   
     src = fetchurl {
       url = "http://ftp.de.debian.org/debian/pool/main/i/ikiwiki/${name}_${version}.tar.gz";
  -    sha256 = "1kakh2bf9k0fhvqhn9p9g4wwck64if2y9z23zmlcrm02bw1m6lr9";
  +    sha256 = "b51fa7452a900212ab1c8c879227b83a688c10f770552aee61944695f8c6f1bf";
     };
   
     buildInputs = [ perl TextMarkdown URI HTMLParser HTMLScrubber HTMLTemplate
       TimeDate gettext makeWrapper DBFile CGISession CGIFormBuilder LocaleGettext
  -    RpcXML XMLSimple PerlMagick]
  +    RpcXML XMLSimple PerlMagick YAML]
       ++ stdenv.lib.optionals gitSupport [git]
       ++ stdenv.lib.optionals monotoneSupport [monotone];
   
  
positive.code:   configurePhase = "perl Makefile.PL PREFIX=$out";
  
    postInstall = ''
      for a in $out/bin/*; do
        wrapProgram $a --suffix PERL5LIB : $PERL5LIB --prefix PATH : ${perl}/bin:$out/bin \
        ${lib.optionalString (git != null)
          ''--prefix PATH : ${git}/bin \''}
  
negative.code: { stdenv, fetchurl, perl, gettext, makeWrapper, lib, PerlMagick, YAML
  , TextMarkdown, URI, HTMLParser, HTMLScrubber, HTMLTemplate, TimeDate
  , CGISession, CGIFormBuilder, DBFile, LocaleGettext, RpcXML, XMLSimple
  , gitSupport ? false
  , git ? null
  , monotoneSupport ? false
  