3 files changed, 21 insertions, 1 deletions
diff --git a/flake.lock b/flake.lock
index 184f197..b846418 100644
--- a/flake.lock
+++ b/flake.lock
@@ -249,6 +249,22 @@
         "type": "indirect"
       }
     },
+    "nixpkgs-oldstable": {
+      "locked": {
+        "lastModified": 1685314633,
+        "narHash": "sha256-8LXBPqTQXl5ofkjpJ18JcbmLJ/lWDoMxtUwiDYv0wro=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c8a17ce7abc03c50cd072e9e6c9b389c5f61836b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "release-22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-unstable": {
       "locked": {
         "lastModified": 1685012353,
@@ -308,6 +324,7 @@
         "isabelle-utils": "isabelle-utils",
         "nix-gleam": "nix-gleam",
         "nixpkgs": "nixpkgs",
+        "nixpkgs-oldstable": "nixpkgs-oldstable",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "playground": "playground",
         "rust-overlay": "rust-overlay",
diff --git a/flake.nix b/flake.nix
index 0d902d1..6ff8cd0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,6 +4,7 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/release-23.05";
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    nixpkgs-oldstable.url = "github:NixOS/nixpkgs/release-22.11";
 
     home-manager.url = "github:nix-community/home-manager/master";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
diff --git a/pkgs/overlay.nix b/pkgs/overlay.nix
index 665f7f6..bd79564 100644
--- a/pkgs/overlay.nix
+++ b/pkgs/overlay.nix
@@ -2,7 +2,8 @@
 self: super:
 
 let
-  unstable = inputs.nixpkgs-unstable.legacyPackages.${self.system}; # { inherit (self) system; };
+  unstable = inputs.nixpkgs-unstable.legacyPackages.${self.system};
+  oldstable = inputs.nixpkgs-oldstable.legacyPackages.${self.system};
   crs-tools = self.callPackage ./crs-tools.nix {};
 in
 {
@@ -96,4 +97,5 @@ in
     src = inputs.bahnhof-name;
   };
 
+  mu = oldstable.mu;
 }