anchor.diff:  
   buildGoModule rec {
     pname = "kustomize";
  -  version = "3.8.7";
  +  version = "3.9.1";
     # rev is the 3.8.7 commit, mainly for kustomize version command output
  -  rev = "ad092cc7a91c07fdf63a2e4b7f13fa588a39af4f";
  +  rev = "7439f1809e5ccd4677ed52be7f98f2ad75122a93";
   
     buildFlagsArray = let t = "sigs.k8s.io/kustomize/api/provenance"; in
       ''
  
positive.code:     owner = "kubernetes-sigs";
      repo = pname;
      rev = "kustomize/v${version}";
      sha256 = "1942cyaj6knf8mc3q2vcz6rqqc6lxdd6nikry9m0idk5l1b09x1m";
    };
  
    # avoid finding test and development commands
    sourceRoot = "source/kustomize";
  
    vendorSha256 = "0y77ykfcbn4l0x85c3hb1lgjpy64kimx3s1qkn38gpmi4lphvkkl";
  
    meta = with lib; {
      description = "Customization of kubernetes YAML configurations";
  
negative.code:     '';
      homepage = "https://github.com/kubernetes-sigs/kustomize";
      license = licenses.asl20;
      maintainers = with maintainers; [ carlosdagos vdemeester periklis zaninime Chili-Man];
    };
  }
  