diff --git a/release.nix b/release.nix
index 7fb07f2..4d49dda 100644
--- a/release.nix
+++ b/release.nix
@@ -78,6 +78,8 @@ in let
     in
       nixpkgs;
 
+in {
+
   # Tweak the nixos make-channel code to include the upstream channel.
   #
   # 1. Replace the git repo nixpkgs with a copy of the unpacked nixpkgs channel.
@@ -95,6 +97,19 @@ in let
           '' + original.distPhase;
     } );
 
-in
+  overlays = {
+    # pkgs - Attribute set of overlayed pkgs.
+    #
+    pkgs =
+      builtins.listToAttrs
+        ( builtins.map ( name: { inherit name; value = pkgs.${name}; } )
+            ( builtins.attrNames ( import ./pkgs/all-packages.nix { } { } ) ) );
 
-  { inherit channel; }
+    # temporary - Attribute set of overlayed pkgs.
+    #
+    temporary =
+      builtins.listToAttrs
+      ( map ( name: { inherit name; value = pkgs.${name}; } )
+          ( builtins.attrNames ( import ./temporary/all-temporary.nix { } { } ) ) );
+  };
+}