more robust $ISABELLE_TMP_PREFIX on windows: avoid location within Cygwin root, i.e. inside the program directory (see also ff92d6edff2c and 1df53737c59b);
#!/usr/bin/env bash
set -e
$ISABELLE_LUALATEX root
$ISABELLE_BIBTEX root
$ISABELLE_LUALATEX root
$ISABELLE_LUALATEX root
./isa-index root
$ISABELLE_LUALATEX root