overlay.nix: add revised nix-derivation

Author: sorki

overlay.nix

@@ -15,6 +15,18 @@ let
       } // (lib.filterAttrs (n: v: n != "url") x));
 in
 {
+  # srk 2025-09-03: until revised version lands in unstable
+  # (due to filepath bound https://github.com/Gabriella439/Haskell-Nix-Derivation-Library/pull/29)
+  nix-derivation = hself.callHackageDirect
+    { pkg = "nix-derivation";
+      ver = "1.1.3";
+      sha256 = "sha256-pklIwd0Atp45AT9x2n3PWAV7tFRqTzv89ViG2iAjoe0=";
+      rev =
+        { revision = "2";
+          sha256 = "sha256-Vv0NIHevaQOyFWBn79Q8OAYZa/Yhas/N1lBHfjANAm4=";
+        };
+    } {};
+
   hnix-store-core =
     lib.pipe
       (hself.callCabal2nix "hnix-store-core" ./hnix-store-core {})