patch & packaging with nix

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    pkgs = import nixpkgs {system = "x86_64-linux";};
+    cl-dates = pkgs.sbcl.buildASDFSystem {
+      pname = "cl-dates";
+      version = "latest";
+      src = ./.;
+    };
+  in {
+    packages.x86_64-linux.default = cl-dates;
+
+    devShells.x86_64-linux.default = pkgs.mkShell {
+      buildInputs = [
+        (pkgs.sbcl.withPackages (ps: [
+          cl-dates
+        ]))
+      ];
+    };
+  };
+}