Yes I found it in the end. Thats a "ioctl should have changed number" case.
The next step up on the IDE info ioctl did get this right Im glad to say
> size of the argument struct passed to the ioctl grew... And the extra
> bytes were padding! They held nothing. They added no functionality.
>
> How were these pagakes 'incorrectly coded' such that they could have
> expected this change?
That one is a bug. No argument.
> way. *No* program dynamically linked against a previous version would
> function any longer because the lookup tables in the compile-time
> headers changed. This is not a minor bug! Nor has this kind of bug
> been a rarity.
>
> *That* is my problem.
No argument.
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