anchor.diff:  
     buildInputs = [
       libcap
  -    libgcrypt
       libidn
  -    nettle
       openssl
       spCompat
     ];
  
positive.code:     "USE_SYSFS=no" # Deprecated
      "USE_IDN=yes" # Experimental
      "WITHOUT_IFADDRS=no"
      "USE_GCRYPT=yes"
      "USE_CRYPTO=shared"
      "USE_RESOLV=yes"
      "ENABLE_PING6_RTHDR=no" # Deprecated
  
negative.code: { stdenv
  , docbook_sgml_dtd_31
  , fetchFromGitHub
  , perlPackages
  
  , libcap
  , libidn
  , openssl
  , spCompat
  }:
  
  let
  in
  stdenv.mkDerivation rec {
    name = "iputils-2016-08-04";
  
    src = fetchFromGitHub {
      owner = "iputils";
      repo = "iputils";
      rev = "3c7b5f7177b62245babe42e1e5b572865186ab7b";
      sha256 = "a2859de8ed13d7d189551cfec8248587bc33ab5e22e498c3b9ed6a5c82e0e7cf";
    };
  
    postPatch =
    /* Fix expected filename */ ''
  