@(cd ..; (which tclsh8.5 >/dev/null && tclsh8.5 tests/test_helper.tcl --tags "${TAGS}") || echo "You need to install Tcl (tclsh8.5) in order to run tests.")
bench:
@(cd ..; (which tclsh8.5 >/dev/null && tclsh8.5 tests/test_helper.tcl --tags "${TAGS}") || echo "You need to install Tcl (tclsh8.5) in order to run tests.")