Wed, 20 Mar 2019 20:15:30 +0100 wenzelm access OCaml tools and libraries via ISABELLE_OCAMLFIND;
Wed, 20 Mar 2019 16:55:21 +0100 wenzelm proper ISABELLE_HOME (ISABELLE_ROOT is for platform-specific application bootstrap);
Wed, 20 Mar 2019 17:33:06 +0100 wenzelm more robust: allow empty root (e.g. via symlink);
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