--- a/lib/Tools/ocaml_setup Tue Mar 19 16:14:59 2019 +0000
+++ b/lib/Tools/ocaml_setup Wed Mar 20 17:33:06 2019 +0100
@@ -6,7 +6,7 @@
set -e
-if [ -d "$ISABELLE_OPAM_ROOT" ]
+if [ -e "$ISABELLE_OPAM_ROOT/config" ]
then
isabelle_opam switch "$ISABELLE_OCAML_VERSION"
else