anchor.diff:      grep -q 'read ans' configure.sh
       sed -i configure.sh \
         -e 's/read ans/true/'
  -
  -    # FIXME: remove hack when updating
  -    grep -q '<netinet/ip.h>' iptunnel.c
  -    sed -i iptunnel.c \
  -      -e '/<netinet\/ip.h>/d'
     '';
   
     configurePhase = ''
  
positive.code: 
    src = fetchurl {
      name = "${name}.tar.xz";
      multihash = "QmSDSsjomFu6VZ5szCWGh9hyYQDFRKzFbQRJ1Deafh1cm7";
      sha256 = "fc8ebe223a7144b6cde07eceac3b7ed7e71b350107002a21162542680ddfee2d";
    };
  
    nativeBuildInputs = [
  
negative.code: }:
  
  let
    date = "2018-11-03";
    gitRev = "0eebece8c964e3cfa8a018f42b2e7e751a7009a0";
  in
  
  stdenv.mkDerivation rec {
  