$ nix-shell -p haskellPackages.jenkinsPlugins2nix
error: Package ‘jenkinsPlugins2nix-0.5.0.0’ in /nix/store/al476r5q8bifinbrysh37yzm7mbryxvd-nixpkgs/nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix:165065 is marked as broken, refusing to evaluate.

       a) To temporarily allow broken packages, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_BROKEN=1

        Note: For `nix shell`, `nix build`, `nix develop` or any other Nix 2.4+
        (Flake) command, `--impure` must be passed in order to read this
        environment variable.

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowBroken = true; }
       in configuration.nix to override this.

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowBroken = true; }
       to ~/.config/nixpkgs/config.nix.
(use '--show-trace' to show detailed location information)

Configuring jenkinsPlugins2nix-0.5.0.0...

Setup: Encountered missing or private dependencies:
attoparsec >=0.13 && <0.14, tasty-hspec >=1.1 && <1.2

test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs:16:9: error:
    Not in scope: type constructor or class ‘Hspec.Spec’
    Module ‘Test.Tasty.Hspec’ does not export ‘Spec’.
   |
16 | spec :: Hspec.Spec
   |         ^^^^^^^^^^

test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs:17:8: error:
    Not in scope: ‘Hspec.describe’
    Module ‘Test.Tasty.Hspec’ does not export ‘describe’.
   |
17 | spec = Hspec.describe "parser spec" $ do
   |        ^^^^^^^^^^^^^^

test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs:18:3: error:
    Not in scope: ‘Hspec.it’
    Module ‘Test.Tasty.Hspec’ does not export ‘it’.
   |
18 |   Hspec.it "parser github-pullrequest manifest" githubPr
   |   ^^^^^^^^

test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs:20:13: error:
    Not in scope: type constructor or class ‘Hspec.Expectation’
    Module ‘Test.Tasty.Hspec’ does not export ‘Expectation’.
   |
20 | githubPr :: Hspec.Expectation
   |             ^^^^^^^^^^^^^^^^^

test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs:21:27: error:
    Not in scope: ‘Hspec.shouldBe’
    Module ‘Test.Tasty.Hspec’ does not export ‘shouldBe’.
   |
21 | githubPr = Right expected `Hspec.shouldBe` runParseManifest githubPrManifestText
   |                           ^^^^^^^^^^^^^^^^