anchor.diff:  
       # MIT licensed
       "geosite.dat" = let
  -      geositeRev = "20201207123222";
  -      geositeSha256 = "03xckk39rrda42cam2awbsh0gib6rhmz28asc8vx29lsp9g2bj6n";
  +      geositeRev = "20210106164413";
  +      geositeSha256 = "0chc7jb3yzgrrjkpd3s1rlim5qgf6j2kp952fvkhpwmnap86aip7";
       in fetchurl {
         url = "https://github.com/v2fly/domain-list-community/releases/download/${geositeRev}/dlc.dat";
         sha256 = geositeSha256;
  
positive.code:     doCheck = false;
  
      buildPhase = ''
        runHook preBuild
  
        go build -o v2ray v2ray.com/core/main
        go build -o v2ctl v2ray.com/core/infra/control/main
  
        runHook postBuild
      '';
  
  
negative.code: }:
  
  let
    version = "4.34.0";
  
    src = fetchFromGitHub {
      owner = "v2fly";
      repo = "v2ray-core";
      rev = "v${version}";
      sha256 = "0x6smffpvnrk76plnsk31qqznkyz06dh4sazncp2l3y9va8k2jb1";
    };
  
    vendorSha256 = "077jnjsmhzr0idrk7pifr5s2r9yjf1v9bvj177n2k2ln8w3wgx3g";
  
    assets = {
      # MIT licensed
      "geoip.dat" = let
        geoipRev = "202101070033";
        geoipSha256 = "11naj51pzchdrjmkp1dqzcby1i2fhbq0mncwm4d5q5mh3chyizsf";
      in fetchurl {
        url = "https://github.com/v2fly/geoip/releases/download/${geoipRev}/geoip.dat";
        sha256 = geoipSha256;
  