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-rw-r--r--isabelle-nix-fhsenv/default.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/isabelle-nix-fhsenv/default.nix b/isabelle-nix-fhsenv/default.nix
index d4e3b9e..b4f5e12 100644
--- a/isabelle-nix-fhsenv/default.nix
+++ b/isabelle-nix-fhsenv/default.nix
@@ -1,5 +1,6 @@
-with import <nixpkgs> { };
+{ pkgs ? import <nixpkgs> { } }:
+with pkgs;
let
isabelle = stdenv.mkDerivation {
pname = "isabelle-unpatched";