anchor.diff:      (builtins.attrNames (builtins.removeAttrs x helperArgNames));
     sourceInfo = rec {
       baseName="foo2zjs";
  -    version="20090908";
  +    version="20110210";
       name="${baseName}-${version}";
  -    url="http://ftp.de.debian.org/debian/pool/main/f/foo2zjs/foo2zjs_${version}dfsg.orig.tar.gz";
  -    hash="1pg4dmckvlx94zxh4gcw7jfmyb10ada7f6vsp5bgz1z95fwwlqjz";
  +    url="http://www.loegria.net/mirrors/foo2zjs/${name}.tar.gz";
  +    hash="0vss8gdbbgxr694xw48rys2qflbnb4sp4gdb1v6z4m9ab97hs5yk";
     };
   in
   rec {
  
positive.code: x@{builderDefsPackage
    , foomatic_filters, bc, unzip, ghostscript
    , ...}:
  builderDefsPackage
  (a :  
  
negative.code:   inherit (sourceInfo) name version;
    inherit buildInputs;
  
    phaseNames = ["fixMakefile" "doMakeDirs" "doMakeInstall" "deployGetWeb"];
    makeFlags = [
        ''PREFIX=$out''
        ''UDEVBIN=$out/bin''
        ''UDEVDIR=$out/etc/udev/rules.d''
        ''UDEVD=${udev}/sbin/udevd''
        ''LIBUDEVDIR=$out/lib/udev/rules.d''
        ''USBDIR=$out/etc/hotplug/usb''
        ''FOODB=$out/share/foomatic/db/source''
        ''MODEL=$out/share/cups/model''
    ];
    installFlags = [ "install-hotplug" ];
    fixMakefile = a.fullDepEntry ''
      touch all-test
      sed -e "/BASENAME=/iPATH=$out/bin:$PATH" -i *-wrapper *-wrapper.in
      sed -e '/install-usermap/d' -i Makefile
      sed -e "s@/etc/hotplug/usb@$out&@" -i *rules*
    '' ["doUnpack" "minInit"];
  
    doMakeDirs = a.fullDepEntry ''
      mkdir -pv $out/{etc/udev/rules.d,lib/udev/rules.d,etc/hotplug/usb}
      mkdir -pv $out/share/foomatic/db/source/{opt,printer,driver}
      mkdir -pv $out/share/cups/model
    '' ["minInit"];
  
    deployGetWeb = a.fullDepEntry ''
      ensureDir "$out/bin"
  