diff --git a/flake.nix b/flake.nix
index d38391f..466ed16 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,5 +1,4 @@
 {
-  
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-21.11";
     nur.url = "github:nix-community/NUR";
@@ -10,7 +9,11 @@
     };
   }; 
 
-  outputs = {self, nixpkgs, home-manager, nur, ...}: {
+  outputs = {self, nixpkgs, home-manager, nur, ...}:
+  let
+    packages = import ./pkgs;
+  in
+  {
     nixosConfigurations.posixlycorrect = nixpkgs.lib.nixosSystem {
       system = "x86_64-linux";
       modules = [ ( import ./base ) ];
@@ -18,12 +21,16 @@
     
     homeConfigurations."fabian@posixlycorrect" = home-manager.lib.homeManagerConfiguration {
       system = "x86_64-linux";
-      configuration = import ./home {inherit nixpkgs;};
+      configuration = import ./home {inherit self nixpkgs;};
       username = "fabian";
       homeDirectory = "/home/fabian";
       stateVersion = "21.11";
     };
 
-    packages.x86_64-linux = import ./pkgs nixpkgs.legacyPackages.x86_64-linux;
+    packages.x86_64-linux = packages nixpkgs.legacyPackages.x86_64-linux;
+
+    overlay = self: super: {
+      local = packages super;
+    };
   };
 }
diff --git a/home/default.nix b/home/default.nix
index df49f82..9ab714f 100644
--- a/home/default.nix
+++ b/home/default.nix
@@ -1,8 +1,10 @@
 # man page: https://rycee.gitlab.io/home-manager/options.html
 
-{ nixpkgs }:
-{ config, pkgs, lib, ... }: {
+{ nixpkgs, self }:
+{ config, pkgs, lib, ... }: with lib; {
   
+  nixpkgs.overlays = [ self.overlay ];
+
   imports = [ ./steam ];
 
   home = {
@@ -14,6 +16,11 @@
       "EDITOR" = "nvim";
       "TERMINAL" = "kitty";
     };
+    file = {
+      ".shenvs".text = let
+        keeps = { gcKeep ? [] }: concatStringsSep "\n" (map toString gcKeep);
+      in keeps (import ../shenvs/config.nix pkgs.local.shenvs);
+    };
   };
 
   systemd.user.tmpfiles.rules = [
diff --git a/pkgs/default.nix b/pkgs/default.nix
index 25e514e..1a9cfe8 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -16,7 +16,7 @@ with pkgs.lib; let
         value = import (root + "/${name}");
       };
     in
-      mapAttrs' entry (filterAttrs isMatch (readDir root));
+      mapAttrs' entry (filterAttrs isMatch (builtins.readDir root));
 
 in {
   shenvs = let
diff --git a/shenvs/config.nix b/shenvs/config.nix
new file mode 100644
index 0000000..722e773
--- /dev/null
+++ b/shenvs/config.nix
@@ -0,0 +1,5 @@
+shenvs: {
+  gcKeep = with shenvs; [
+    armasm
+  ];
+}