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I use NixOS, and I'm trying to set up a Nix Haskell environment for my Haskell project. I have this Haskell package written in Nix that I'm trying to get working via nix-shell, but the dependent Haskell package Clay won't build, as described in this bug report I just opened. How can I override this package with a different (older or newer, I guess it doesn't matter) version of this Haskell package that works?

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Not completely relevant, however I needed to modify an existing package that failed to build. I ended up with:

nixpkgs.config.packageOverrides = pkgs: {
    haskellPackages = pkgs.haskellPackages.override {
      overrides = hsSelf: hsSuper: {
        greenclip  = pkgs.haskell.lib.overrideCabal hsSuper.greenclip  (oa: {
          version = "3.1.1";
          sha256 = "1axh1q7kcvcnhn4rl704i4gcix5yn5v0sb3bdgjk4vgkd7fv8chw";
          executablePkgconfigDepends = oa.executablePkgconfigDepends ++ [pkgs.xorg.libXdmcp];
        });

        wordexp  = pkgs.haskell.lib.overrideCabal hsSuper.wordexp  (oa: {
          version = "0.2.2";
          sha256 = "1mbcrq89jz0dcibw66w0jdy4f4bfpx4zwjfs98rm3jjgdikwdzb4";
        });
      };
    };
  };

The above went in my configuration.nix

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