shell.nix in oddb2xml-2.7.7 vs shell.nix in oddb2xml-2.7.8

@@ -2,9 +2,11 @@
 # A small helper script to get a development version for oddb2xml under NixOS
 with import <nixpkgs> {};
 stdenv.mkDerivation {
   name = "env";
   buildInputs = [
+    ruby_3_0
+    rubyPackages_3_0.safe_yaml
     ruby_3_0.devEnv
     git
     python
     libpcap
     libxml2