anchor.diff: -{ stdenv, fetchurl, openssl, lzo, zlib, gcc, iproute, ronn }:
  +{ stdenv, fetchurl, openssl, lzo, zlib, iproute, which, ronn }:
   
   stdenv.mkDerivation rec {
     version = "1.1.6";
  
positive.code:         --replace 'ronn -r' '${ronn}/bin/ronn -r'
    '';
  
    buildInputs = [ openssl lzo zlib gcc iproute ronn ];
  
    installPhase = ''
      install -Dt "$out/bin/" zerotier-one
  
negative.code:   };
  
    preConfigure = ''
        substituteInPlace ./osdep/LinuxEthernetTap.cpp \
          --replace 'execlp("ip",' 'execlp("${iproute}/bin/ip",'
  
  