mateamt: simplify by 1000%

mateamt.nix

@@ -1,38 +1,7 @@
-{ pkgs ? import <nixpkgs> {}
+{ pkgs ? import <nixpkgs> (import <haskell-nix>)
 }:
-with pkgs;
-let
-  mateamtSrc = stdenv.mkDerivation {
-    name = "mateamt-src";
-    src = <mateamt>;
-    phases = [ "unpackPhase" "patchPhase" "installPhase" ];
-    patchPhase = ''
-      substituteInPlace default.nix \
-        --replace \
-        "builtins.fetchTarball https://github.com/input-output-hk/haskell.nix/archive/master.tar.gz" \
-        "<haskell-nix>"
-    '';
-    installPhase = "cp -ar . $out";
-  };
-  mateamt = haskellPackages.callPackage "${mateamtSrc}";
-  ghcBlacklist = [
-    # "ghc822"
-    # "ghc844"
-    # "ghc881"
-    # "ghcHEAD"
-  ];
-  ghcVersions =
-    builtins.filter (p:
-      (p == "ghcHEAD" || builtins.match "ghc[[:digit:]]+" p != null) &&
-      (!builtins.elem p ghcBlacklist)
-    ) (builtins.attrNames haskell.packages);
-in
-
-builtins.listToAttrs
-  (map (ghcVersion: {
-    name = "mateamt-${ghcVersion}";
-    value = lib.hydraJob (mateamt {
-      compiler = ghcVersion;
-      nixpkgs = pkgs;
-    });
-  }) ghcVersions)
+{
+  mateamt = pkgs.lib.hydraJob (import <mateamt> {
+    inherit pkgs;
+  });
+}