anchor.diff: -{ lib, stdenv, fetchFromGitHub, fetchpatch
  +{ lib, stdenv, fetchFromGitHub
   , autoreconfHook269, util-linux, nukeReferences, coreutils
   , perl, buildPackages
   , configFile ? "all"
  
positive.code: let
    buildKernel = any (n: n == configFile) [ "kernel" "all" ];
    buildUser = any (n: n == configFile) [ "user" "all" ];
  
    # remove this patch at the next ZFS release (> 2.0.1)
    reapplyPathSanitizerPatch = fetchpatch {
      url = "https://github.com/openzfs/zfs/commit/03f036cbccdd8699f5fe8540ef317595a35bceb8.patch";
      sha256 = "c157bbb6551a4e720c3faba005e1b72e4692d304c6ff5e0e685691bd47197dca";
    };
  
    common = { version
      , sha256
  
negative.code:     # incompatibleKernelVersion = "4.20";
  
      # this package should point to the latest release.
      version = "2.0.2";
  
      sha256 = "sha256-KzrRQwfQRvIQkHG5mj6cGBdcv2VEhC5y7bi09DaKqhY=";
    };
  
    zfsUnstable = common {
  