--- a/lib/Tools/ocaml_setup Wed Mar 20 20:33:40 2019 +0100
+++ b/lib/Tools/ocaml_setup Wed Mar 20 21:15:20 2019 +0100
@@ -13,4 +13,4 @@
isabelle_opam init --no-setup --compiler="$ISABELLE_OCAML_VERSION"
fi
-isabelle_opam install zarith
+isabelle_opam install zarith -y