use bdwgc from sydpkgs

bdwgc.nix

@@ -1,18 +0,0 @@
-{ cmake
-, stdenv
-, fetchFromGitHub
-}:
-
-stdenv.mkDerivation (finalAttrs: {
-  pname = "bdwgc";
-  version = "8.2.12";
-  src = fetchFromGitHub {
-    owner = "bdwgc";
-    repo = "bdwgc";
-    tag = "v${finalAttrs.version}";
-    hash = "sha256-5yeAB5Y92YjOutwRXBJkMxoOLkmzmqIJs4PirKX89fE=";
-  };
-  nativeBuildInputs = [
-    cmake
-  ];
-})

flake.lock

@@ -591,7 +591,8 @@
         "nixpkgs": [
           "haskellNix",
           "nixpkgs-unstable"
-        ]
+        ],
+        "sydpkgs": "sydpkgs"
       }
     },
     "stackage": {
@@ -609,6 +610,26 @@
         "repo": "stackage.nix",
         "type": "github"
       }
+    },
+    "sydpkgs": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1778962331,
+        "narHash": "sha256-qMokSV7hsWYiDCkkBGyG0aD4Ds3JLzJzJ0Cp9f/spJU=",
+        "ref": "refs/heads/main",
+        "rev": "59d3a471cd960f9d1f6c645a4fe578a670848e9d",
+        "revCount": 41,
+        "type": "git",
+        "url": "https://git.deertopia.net/msyds/sydpkgs"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://git.deertopia.net/msyds/sydpkgs"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -3,9 +3,13 @@
     haskellNix.url = "github:input-output-hk/haskell.nix";
     # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
     nixpkgs.follows = "haskellNix/nixpkgs-unstable";
+    sydpkgs = {
+      url = "git+https://git.deertopia.net/msyds/sydpkgs";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, haskellNix, ... }@inputs:
+  outputs = { self, nixpkgs, sydpkgs, haskellNix, ... }@inputs:
     let
       supportedSystems = [
         "aarch64-darwin" "aarch64-linux"
@@ -15,21 +19,10 @@
       overlays = [
         haskellNix.overlay
         (final: prev: {
-          bdwgc = final.callPackage ./bdwgc.nix {};
+          inherit (sydpkgs.packages.${final.stdenv.hostPlatform.system})
+            bdwgc;
         })
         (final: prev: {
-          # haskellPackages = prev.haskellPackages.override {
-          #   qbe = final.haskell-nix.project' {
-          #     src = final.fetchFromGitea {
-          #       domain = "git.deertopia.net";
-          #       owner = "msyds";
-          #       repo = "qbe-hs";
-          #       rev = "master";
-          #       hash = "sha256-3Ni2xFOvw7Qjzq7BIXfnSQQ3U99OaEH0j6SdILMYizs=";
-          #     };
-          #     compiler-nix-name = "ghc912";
-          #   };
-          # };
           gyehoek = final.haskell-nix.project' {
             src = ./.;
             compiler-nix-name = "ghc912";