anchor.diff:    buildInputs = [
       coreutils
       iproute2
  -    ipset
       iptables
  -    ebtables
       util-linux
       gnugrep
       gnused
  
positive.code:            [ "${coreutils}/bin"
               "${iproute2}/bin"
               "${iptables}/bin"
               "${ipset}/bin"
               "${ebtables}/bin"
               "${util-linux}/bin"
               "${gnugrep}/bin"
               "${gnused}/bin"
  
negative.code: { coreutils
  , fetchurl
  , gnugrep
  , gnused
  , iproute2
  , iptables
  , perl
  , perlPackages
  