I still haven't succeeded in building the Ada component for GCC-10. However, I have identified the above (new) gratuitous dependency, as one of the points of failure; consequently, I have developed what I hope will be a "legacy-safe" variant of this Microsoft API; see: https://osdn.net/projects/mingw/ticket/42383 As noted on that ticket, I have verified the behaviour on WinXP, and on Win7, but I don't have any other versions of Windows, on which I can readily test it. (I did try to set up a Win10 VM, but after waiting two hours from start-up to getting a desktop, and then, since trying to do anything from there was like wading through treacle, I gave up)! I would be grateful if anyone is able to test on other Windows versions; in particular, anyone who can verify that all of the defined APIs return an indication of "unsupported", when run on Win2K or earlier, and on Win9x. TIA. -- Regards, Keith. Public key available from keys.gnupg.net Key fingerprint: C19E C018 1547 DE50 E1D4 8F53 C0AD 36C6 347E 5A3F