more robust check of ISABELLE_PLATFORM_FAMILY within settings environment, to support its reunification with Isabelle/Scala (see also a33a6e541cbb, f3a356c64193);
#!/usr/bin/env bash
#
# DESCRIPTION: build other Isabelle from sync_repos directory
unset CDPATH
THIS="$(cd "$(dirname "$0")"; pwd)"
"$THIS/../bin/isabelle" scala_build -q || exit $?
"$THIS/../bin/isabelle_java" isabelle.Build_History "$@"