flake.nix

@@ -164,19 +164,23 @@
           lib = self;
         }
       );
+      packageSetup = import ./pkgs/default.nix { inherit nixpkgs; };
+      inherit (packageSetup) localPackagesOverlay;
       inherit (lib.adev.systems) genSystems getImages;
       inherit (self) outputs; # for hydra
     in
     rec {
       inherit lib; # for allowing use of custom functions in nix repl
 
+      overlays.default = localPackagesOverlay;
+
       hydraJobs = import ./hydra/jobs.nix { inherit inputs outputs systems; };
       formatter = forEachSystem (system: nixpkgs.legacyPackages.${system}.nixfmt);
 
       nixosConfigurations = genSystems inputs outputs src (src + "/systems");
       homeConfigurations = {
         "alice" = inputs.home-manager.lib.homeManagerConfiguration {
-          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          pkgs = packageSetup.mkPkgs "x86_64-linux";
           modules = [
             inputs.stylix.homeModules.stylix
             inputs.sops-nix.homeManagerModules.sops
@@ -203,13 +207,7 @@
         qcow = getImages nixosConfigurations "qcow";
       };
 
-      packages.x86_64-linux.lego-latest =
-        nixpkgs.legacyPackages.x86_64-linux.callPackage ./pkgs/lego-latest/default.nix
-          { };
-
-      packages.x86_64-linux.claurst =
-        nixpkgs.legacyPackages.x86_64-linux.callPackage ./pkgs/claurst/default.nix
-          { };
+      packages = forEachSystem packageSetup.mkPackages;
 
       checks = import ./checks.nix { inherit inputs forEachSystem formatter; };
       devShells = import ./shell.nix { inherit inputs forEachSystem checks; };

pkgs/default.nix

@@ -0,0 +1,33 @@
+{ nixpkgs }:
+let
+  localPackagesOverlay = final: _prev: {
+    lego-latest = final.callPackage ./lego-latest/default.nix { };
+    claurst = final.callPackage ./claurst/default.nix { };
+  };
+
+  mkPkgs =
+    system:
+    import nixpkgs {
+      inherit system;
+      overlays = [ localPackagesOverlay ];
+    };
+
+  mkPackages =
+    system:
+    let
+      pkgs = mkPkgs system;
+    in
+    {
+      inherit (pkgs)
+        lego-latest
+        claurst
+        ;
+    };
+in
+{
+  inherit
+    localPackagesOverlay
+    mkPkgs
+    mkPackages
+    ;
+}

users/alice/home.nix

@@ -2,7 +2,6 @@
   config,
   pkgs,
   lib,
-  outputs,
   machineConfig,
   ...
 }:
@@ -91,7 +90,7 @@
 
       gocryptfs
       awscli2
-      outputs.packages.${pkgs.system}.claurst
+      claurst
     ];
   };