diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
new file mode 100644
index 0000000..7748d40
--- /dev/null
+++ b/.gitea/workflows/build.yaml
@@ -0,0 +1,11 @@
+name: build
+on: [push]
+
+jobs:
+  build:
+    runs-on: nixos
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: build qbe-hs
+        run: nix build -L .
diff --git a/flake.lock b/flake.lock
index b3b5542..3519aef 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,12 +1,564 @@
 {
   "nodes": {
-    "nixpkgs": {
+    "HTTP": {
+      "flake": false,
       "locked": {
-        "lastModified": 1776949667,
-        "narHash": "sha256-GMSVw35Q+294GlrTUKlx087E31z7KurReQ1YHSKp5iw=",
+        "lastModified": 1451647621,
+        "narHash": "sha256-oHIyw3x0iKBexEo49YeUDV1k74ZtyYKGR2gNJXXRxts=",
+        "owner": "phadej",
+        "repo": "HTTP",
+        "rev": "9bc0996d412fef1787449d841277ef663ad9a915",
+        "type": "github"
+      },
+      "original": {
+        "owner": "phadej",
+        "repo": "HTTP",
+        "type": "github"
+      }
+    },
+    "cabal-34": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1645834128,
+        "narHash": "sha256-wG3d+dOt14z8+ydz4SL7pwGfe7SiimxcD/LOuPCV6xM=",
+        "owner": "haskell",
+        "repo": "cabal",
+        "rev": "5ff598c67f53f7c4f48e31d722ba37172230c462",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "3.4",
+        "repo": "cabal",
+        "type": "github"
+      }
+    },
+    "cabal-36": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1669081697,
+        "narHash": "sha256-I5or+V7LZvMxfbYgZATU4awzkicBwwok4mVoje+sGmU=",
+        "owner": "haskell",
+        "repo": "cabal",
+        "rev": "8fd619e33d34924a94e691c5fea2c42f0fc7f144",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "3.6",
+        "repo": "cabal",
+        "type": "github"
+      }
+    },
+    "cardano-shell": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1608537748,
+        "narHash": "sha256-PulY1GfiMgKVnBci3ex4ptk2UNYMXqGjJOxcPy2KYT4=",
+        "owner": "input-output-hk",
+        "repo": "cardano-shell",
+        "rev": "9392c75087cb9a3d453998f4230930dea3a95725",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "cardano-shell",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1672831974,
+        "narHash": "sha256-z9k3MfslLjWQfnjBtEtJZdq3H7kyi2kQtUThfTgdRk0=",
+        "owner": "input-output-hk",
+        "repo": "flake-compat",
+        "rev": "45f2638735f8cdc40fe302742b79f248d23eb368",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "ref": "hkm/gitlab-fix",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "hackage": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1776991436,
+        "narHash": "sha256-nR65DbgoJ8Qm8qEtqmVXzeWZS+cc3FeqaZgFon8qdtc=",
+        "owner": "input-output-hk",
+        "repo": "hackage.nix",
+        "rev": "2a5e0e1854e7f651ce13df74a60d7c2990a63528",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "hackage.nix",
+        "type": "github"
+      }
+    },
+    "hackage-for-stackage": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1776991429,
+        "narHash": "sha256-uiuvT6/wp2uNdtVl8kQ70WSyrye6EdRRQ+yor9kIJLU=",
+        "owner": "input-output-hk",
+        "repo": "hackage.nix",
+        "rev": "793f260668f3f8d34f64056e6941d234093fc51e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "ref": "for-stackage",
+        "repo": "hackage.nix",
+        "type": "github"
+      }
+    },
+    "hackage-internal": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1750307553,
+        "narHash": "sha256-iiafNoeLHwlSLQTyvy8nPe2t6g5AV4PPcpMeH/2/DLs=",
+        "owner": "input-output-hk",
+        "repo": "hackage.nix",
+        "rev": "f7867baa8817fab296528f4a4ec39d1c7c4da4f3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "hackage.nix",
+        "type": "github"
+      }
+    },
+    "haskellNix": {
+      "inputs": {
+        "HTTP": "HTTP",
+        "cabal-34": "cabal-34",
+        "cabal-36": "cabal-36",
+        "cardano-shell": "cardano-shell",
+        "flake-compat": "flake-compat",
+        "hackage": "hackage",
+        "hackage-for-stackage": "hackage-for-stackage",
+        "hackage-internal": "hackage-internal",
+        "hls": "hls",
+        "hls-1.10": "hls-1.10",
+        "hls-2.0": "hls-2.0",
+        "hls-2.10": "hls-2.10",
+        "hls-2.11": "hls-2.11",
+        "hls-2.12": "hls-2.12",
+        "hls-2.2": "hls-2.2",
+        "hls-2.3": "hls-2.3",
+        "hls-2.4": "hls-2.4",
+        "hls-2.5": "hls-2.5",
+        "hls-2.6": "hls-2.6",
+        "hls-2.7": "hls-2.7",
+        "hls-2.8": "hls-2.8",
+        "hls-2.9": "hls-2.9",
+        "hpc-coveralls": "hpc-coveralls",
+        "iserv-proxy": "iserv-proxy",
+        "nixpkgs": [
+          "haskellNix",
+          "nixpkgs-unstable"
+        ],
+        "nixpkgs-2305": "nixpkgs-2305",
+        "nixpkgs-2311": "nixpkgs-2311",
+        "nixpkgs-2405": "nixpkgs-2405",
+        "nixpkgs-2411": "nixpkgs-2411",
+        "nixpkgs-2505": "nixpkgs-2505",
+        "nixpkgs-2511": "nixpkgs-2511",
+        "nixpkgs-unstable": "nixpkgs-unstable",
+        "old-ghc-nix": "old-ghc-nix",
+        "stackage": "stackage"
+      },
+      "locked": {
+        "lastModified": 1776993036,
+        "narHash": "sha256-M770+TVYcqAlBAGWEi9HeljqNxujcNBlsNmZCwnxQaI=",
+        "owner": "input-output-hk",
+        "repo": "haskell.nix",
+        "rev": "902f9c7fee56b7550293dd691264f0c889e7af26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "haskell.nix",
+        "type": "github"
+      }
+    },
+    "hls": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1741604408,
+        "narHash": "sha256-tuq3+Ip70yu89GswZ7DSINBpwRprnWnl6xDYnS4GOsc=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "682d6894c94087da5e566771f25311c47e145359",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-1.10": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1680000865,
+        "narHash": "sha256-rc7iiUAcrHxwRM/s0ErEsSPxOR3u8t7DvFeWlMycWgo=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "b08691db779f7a35ff322b71e72a12f6e3376fd9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "1.10.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.0": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1687698105,
+        "narHash": "sha256-OHXlgRzs/kuJH8q7Sxh507H+0Rb8b7VOiPAjcY9sM1k=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "783905f211ac63edf982dd1889c671653327e441",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.0.0.1",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.10": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1743069404,
+        "narHash": "sha256-q4kDFyJDDeoGqfEtrZRx4iqMVEC2MOzCToWsFY+TOzY=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "2318c61db3a01e03700bd4b05665662929b7fe8b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.10.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.11": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1747306193,
+        "narHash": "sha256-/MmtpF8+FyQlwfKHqHK05BdsxC9LHV70d/FiMM7pzBM=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "46ef4523ea4949f47f6d2752476239f1c6d806fe",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.11.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.12": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1758709460,
+        "narHash": "sha256-xkI8MIIVEVARskfWbGAgP5sHG/lyeKnkm0LIOJ19X5w=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "7d983de4fa7ff54369f6dd31444bdb9869aec83e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.12.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1693064058,
+        "narHash": "sha256-8DGIyz5GjuCFmohY6Fa79hHA/p1iIqubfJUTGQElbNk=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "b30f4b6cf5822f3112c35d14a0cba51f3fe23b85",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.2.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.3": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1695910642,
+        "narHash": "sha256-tR58doOs3DncFehHwCLczJgntyG/zlsSd7DgDgMPOkI=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "458ccdb55c9ea22cd5d13ec3051aaefb295321be",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.3.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.4": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1699862708,
+        "narHash": "sha256-YHXSkdz53zd0fYGIYOgLt6HrA0eaRJi9mXVqDgmvrjk=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "54507ef7e85fa8e9d0eb9a669832a3287ffccd57",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.4.0.1",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.5": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1701080174,
+        "narHash": "sha256-fyiR9TaHGJIIR0UmcCb73Xv9TJq3ht2ioxQ2mT7kVdc=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "27f8c3d3892e38edaef5bea3870161815c4d014c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.5.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.6": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1705325287,
+        "narHash": "sha256-+P87oLdlPyMw8Mgoul7HMWdEvWP/fNlo8jyNtwME8E8=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "6e0b342fa0327e628610f2711f8c3e4eaaa08b1e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.6.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.7": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1708965829,
+        "narHash": "sha256-LfJ+TBcBFq/XKoiNI7pc4VoHg4WmuzsFxYJ3Fu+Jf+M=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "50322b0a4aefb27adc5ec42f5055aaa8f8e38001",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.7.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.8": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1715153580,
+        "narHash": "sha256-Vi/iUt2pWyUJlo9VrYgTcbRviWE0cFO6rmGi9rmALw0=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "dd1be1beb16700de59e0d6801957290bcf956a0a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.8.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.9": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1719993701,
+        "narHash": "sha256-wy348++MiMm/xwtI9M3vVpqj2qfGgnDcZIGXw8sF1sA=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "90319a7e62ab93ab65a95f8f2bcf537e34dae76a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.9.0.1",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hpc-coveralls": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1607498076,
+        "narHash": "sha256-8uqsEtivphgZWYeUo5RDUhp6bO9j2vaaProQxHBltQk=",
+        "owner": "sevanspowell",
+        "repo": "hpc-coveralls",
+        "rev": "14df0f7d229f4cd2e79f8eabb1a740097fdfa430",
+        "type": "github"
+      },
+      "original": {
+        "owner": "sevanspowell",
+        "repo": "hpc-coveralls",
+        "type": "github"
+      }
+    },
+    "iserv-proxy": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1775620557,
+        "narHash": "sha256-10x8/G0x3eR/++XRHPx4MBuqlnc6+N+ajIxXyLkG+nU=",
+        "owner": "stable-haskell",
+        "repo": "iserv-proxy",
+        "rev": "3f7b2815307c20a0dfd816bdf4a39ab86af3e0d4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "stable-haskell",
+        "ref": "iserv-syms",
+        "repo": "iserv-proxy",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2305": {
+      "locked": {
+        "lastModified": 1705033721,
+        "narHash": "sha256-K5eJHmL1/kev6WuqyqqbS1cdNnSidIZ3jeqJ7GbrYnQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "01fbdeef22b76df85ea168fbfe1bfd9e63681b30",
+        "rev": "a1982c92d8980a0114372973cbdfe0a307f1bdea",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-23.05-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2311": {
+      "locked": {
+        "lastModified": 1719957072,
+        "narHash": "sha256-gvFhEf5nszouwLAkT9nWsDzocUTqLWHuL++dvNjMp9I=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7144d6241f02d171d25fba3edeaf15e0f2592105",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-23.11-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2405": {
+      "locked": {
+        "lastModified": 1735564410,
+        "narHash": "sha256-HB/FA0+1gpSs8+/boEavrGJH+Eq08/R2wWNph1sM1Dg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1e7a8f391f1a490460760065fa0630b5520f9cf8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-24.05-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2411": {
+      "locked": {
+        "lastModified": 1751290243,
+        "narHash": "sha256-kNf+obkpJZWar7HZymXZbW+Rlk3HTEIMlpc6FCNz0Ds=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5ab036a8d97cb9476fbe81b09076e6e91d15e1b6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-24.11-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2505": {
+      "locked": {
+        "lastModified": 1764560356,
+        "narHash": "sha256-M5aFEFPppI4UhdOxwdmceJ9bDJC4T6C6CzCK1E2FZyo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "6c8f0cca84510cc79e09ea99a299c9bc17d03cb6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-25.05-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2511": {
+      "locked": {
+        "lastModified": 1775749320,
+        "narHash": "sha256-msT6frWJSQ2WR+0cpk+KPcZdLTLagUIsJwQwIX9JNSo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "74b87959b2d16f59f54d8559cf3cf26b9d907949",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-25.11-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1775888245,
+        "narHash": "sha256-nwASzrRDD1JBEu/o8ekKYEXm/oJW6EMCzCRdrwcLe90=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "13043924aaa7375ce482ebe2494338e058282925",
         "type": "github"
       },
       "original": {
@@ -16,9 +568,46 @@
         "type": "github"
       }
     },
+    "old-ghc-nix": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1631092763,
+        "narHash": "sha256-sIKgO+z7tj4lw3u6oBZxqIhDrzSkvpHtv0Kki+lh9Fg=",
+        "owner": "angerman",
+        "repo": "old-ghc-nix",
+        "rev": "af48a7a7353e418119b6dfe3cd1463a657f342b8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "angerman",
+        "ref": "master",
+        "repo": "old-ghc-nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "haskellNix": "haskellNix",
+        "nixpkgs": [
+          "haskellNix",
+          "nixpkgs-unstable"
+        ]
+      }
+    },
+    "stackage": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1776990505,
+        "narHash": "sha256-PC/DD76TdzSvs18mL3O7V4wwt6WRHlzxmdrpKFwz68A=",
+        "owner": "input-output-hk",
+        "repo": "stackage.nix",
+        "rev": "c8e2fb3340b2316c84fede31ac01b5446fe2c880",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "stackage.nix",
+        "type": "github"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index 3026aeb..bcf2df5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,42 +1,82 @@
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    haskellNix.url = "github:input-output-hk/haskell.nix";
+    # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    nixpkgs.follows = "haskellNix/nixpkgs-unstable";
   };
 
-  outputs = { self, nixpkgs, ... }@inputs:
+  outputs = { self, nixpkgs, haskellNix, ... }@inputs:
     let
       supportedSystems = [
         "aarch64-darwin" "aarch64-linux"
         "x86_64-darwin" "x86_64-linux"
       ];
 
+      overlays = [
+        haskellNix.overlay
+        (final: _prev: {
+          # This overlay adds our project to pkgs
+          qbe-hs = final.haskell-nix.project' {
+            src = ./.;
+            compiler-nix-name = "ghc912";
+            # This is used by `nix develop .` to open a shell for use with
+            # `cabal`, `hlint` and `haskell-language-server`
+            shell.tools = {
+              cabal = {};
+              # hlint = {};
+              # haskell-language-server = {};
+            };
+            # Non-Haskell shell tools go here
+            shell.buildInputs = with final; [
+              gcc
+              qbe
+            ];
+            # passthru = { inherit (final) qbe; };
+            # This adds `js-unknown-ghcjs-cabal` to the shell.
+            # shell.crossPlatforms = p: [p.ghcjs];
+          };
+        })
+      ];
+
       each-system = f: nixpkgs.lib.genAttrs supportedSystems (system: f rec {
 	pkgs = import nixpkgs {
-          inherit system;
+          inherit system overlays;
         };
 	inherit (pkgs) lib;
         inherit system;
       });
+
+      # haskell-flake
+      hf =
+        let
+          keys = [
+            "packages" "apps" "devShells"
+            "hydraJobs" "ciJobs" "checks"
+          ];
+        in nixpkgs.lib.genAttrs keys
+          (k: each-system ({ pkgs, ... }: (pkgs.qbe-hs.flake {}).${k}));
     in {
       # Exposed as a REPL convenience.
       _pkgs = each-system ({ pkgs, ... }: pkgs);
 
-      packages = each-system ({ pkgs, ... }: {
-        # default = pkgs.callPackage ./default.nix {};
-      });
+      packages = each-system ({ pkgs, system, ... }:
+        hf.packages.${system} // {
+          default = hf.packages.${system}."qbe:lib:qbe";
+        });
 
-      devShells = each-system ({ pkgs, system, ... }: {
-	default = pkgs.haskellPackages.developPackage {
-          root = ./.;
-          modifier = drv:
-            pkgs.haskell.lib.addBuildTools
-              drv
-              (with pkgs; [
-                cabal-install
-                qbe
-                gcc
-              ]);
-	};
-      });
+      devShells = each-system
+        ({ pkgs, system, ... }: hf.devShells.${system});
     };
+
+  nixConfig = {
+    extra-substituters = [
+      "https://cache.iog.io"
+      "https://cache.zw3rk.com"
+    ];
+    extra-trusted-public-keys = [
+      "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="
+      "loony-tools:pr9m4BkM/5/eSTZlkQyRt57Jz7OMBxNSUiMC4FkcNfk="
+    ];
+    allow-import-from-derivation = "true";
+  };
 }
diff --git a/qbe.cabal b/qbe.cabal
index 3341b73..f2bf453 100644
--- a/qbe.cabal
+++ b/qbe.cabal
@@ -56,11 +56,15 @@ library
                                      || ^>= 4.15
                                      || ^>= 4.17
                                      || ^>= 4.20
+                                     || ^>= 4.21
+                                     || ^>= 4.22
                     , text              ^>= 1.2.5
-                                     || ^>= 2.0
-                    , text-short        >= 0.1 || <=0.1.6.1
+                                     || ^>= 2.1.4
+                    , text-short        >= 0.1 || ^>= 0.1.6.1
                     , bytestring        ^>= 0.11.3
+                                     || ^>= 0.12
                     , hashable          ^>= 1.4.0
+                                       || ^>= 1.5.0
                     , deepseq           ^>= 1.4.4 || ^>= 1.5
                     , prettyprinter     ^>= 1.7.1
     hs-source-dirs:   src
@@ -75,7 +79,7 @@ test-suite golden
                     , prettyprinter
                     , filepath          ^>= 1.4.2.2
                     , tasty             ^>= 1.4.2.3
-                    , tasty-silver      ^>= 3.3.1.1
+                    , tasty-silver      ^>= 3.3.1.1 || ^>= 3.3.2.1
     other-extensions: TypeApplications
                       OverloadedStrings
                       DataKinds