libxslt: also add libgcrypt

default.nix

@@ -2,10 +2,13 @@ with import <nixpkgs> {};
 stdenv.mkDerivation {
   name = "env";
   buildInputs = [
-    (libxslt.override {
+    ((libxslt.override {
       # added in nixpkgs 11-12-2016
       cryptoSupport = true;
-    })
+    }).overrideAttrs (old: {
+      # can be removed eventually: https://github.com/NixOS/nixpkgs/pull/53346
+      buildInputs = old.buildInputs ++ [ libgcrypt ];
+    }))
     libxml2
     wget
     rsync