anchor.diff:    enableParallelBuilding = true;
   
     meta = with stdenv.lib; {
  -    homepage = https://libreswan.org;
  +    homepage = "https://libreswan.org";
       description = "A free software implementation of the VPN protocol based on IPSec and the Internet Key Exchange";
       platforms = platforms.linux ++ platforms.darwin ++ platforms.freebsd;
       license = licenses.gpl2;
  
positive.code: 
    src = fetchurl {
      url = "https://download.libreswan.org/${name}.tar.gz";
      sha256 = "1bww4w5r6hx0xf9xdxvkfmcv7zyas58ls1mklk6k197kv2i0p24w";
    };
  
    # These flags were added to compile v3.18. Try to lift them when updating.
  
negative.code: 
  let
    optional = stdenv.lib.optional;
    version = "3.31";
    name = "libreswan-${version}";
    binPath = stdenv.lib.makeBinPath [
      bash iproute iptables procps coreutils gnused gawk nss.tools which python
  