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:       name = "net-tools-tarball-${date}";
  
        src = fetchgit {
          version = 1;
          url = "http://git.code.sf.net/p/net-tools/code";
          rev = gitRev;
          sha256 = "1f7myyc490nq29dhs45sm2njxwdnck69pm9ixiwgj44mxdmj3rbm";
        };
  
        buildPhase = ''
  
negative.code: }:
  
  let
    date = "2018-11-03";
    gitRev = "0eebece8c964e3cfa8a018f42b2e7e751a7009a0";
  in
  
  stdenv.mkDerivation rec {
  