In a message of Sun, 19 Jul 2015 23:59:29 +1000, "Steven D'Aprano" writes: >Bug for bug compatible back to the 1970s, right? :-) No, till the last posix in 1989 or so. Definitely not to the 1970s as we want v7 c structs and x++ not the v6 ++x version. :) Laura