anchor.diff:    outputs = [ "bin" "dev" "lib" "out" ]; # $out contains all the config
   
     propagatedBuildInputs = [ freetype ];
  -  nativeBuildInputs = [ pkgconfig gperf ];
  +  nativeBuildInputs = [ pkgconfig gperf libxslt ];
     buildInputs = [ expat ];
   
     configureFlags = [
  
positive.code:     maintainers = [ maintainers.vcunat ];
    };
  }
  
  
negative.code: 
    postInstall = ''
      cd "$out/etc/fonts"
      xsltproc --stringparam fontDirectories "${dejavu_fonts.minimal}" \
        --stringparam fontconfigConfigVersion "${configVersion}" \
        --path $out/share/xml/fontconfig \
        ${./make-fonts-conf.xsl} $out/etc/fonts/fonts.conf \
  