anchor.diff: -{ lib, buildGoModule, fetchFromGitHub, testers, docker-credential-gcr }:
  +{ lib, buildGoModule, fetchFromGitHub, fetchpatch, testers, docker-credential-gcr }:
   
   buildGoModule rec {
     pname = "docker-credential-gcr";
  
positive.code:     sha256 = "sha256-gb9c8qTHQWUOlaXAKfpwm0Pwa/N4iu48jWIwPYXD00k=";
    };
  
    vendorSha256 = "sha256-e7XNTizZYp/tS7KRvB9KxY3Yurphnm6Ehz4dHZNReK8=";
  
    CGO_ENABLED = 0;
  
negative.code:     "-w"
      "-X github.com/GoogleCloudPlatform/docker-credential-gcr/config.Version=${version}"
    ];
  
    passthru.tests.version = testers.testVersion {
      package = docker-credential-gcr;
  