dendritic: first succesfull rebuild

modules/packages/README.md

@@ -5,3 +5,13 @@ For example, to use a newer package version that is still not in nixpkgs-unstabl
 Some rules about package naming:
 * If it is a custom derivation of a package, end with `ManuallyDerived`
 * If it is a script, start with `custom-`. The executable, package name (and file name if it is the only thing in this nix file) must be equal.
+
+
+If perSystem needs `pkgs-unstable` pass it manually with
+```
+{ self, ... }: {
+  perSystem = { pkgs, ...}:
+  let
+    pkgs-unstable = self.pkgs-unstable;
+  in
+```