Re: texinfo 6.0 texindex problem?

[Gavin Smith]

On 9 October 2015 at 08:06, Eli Zaretskii <address@hidden> wrote:
> Btw, my usual problem with such new features is that it's impossible
> (AFAIK) to use them in a manual in a backward-compatible way,
> i.e. while making sure older versions of makeinfo will process the
> manual without errors.  That's because there's no way (again AFAIK) to
> write a condition that tests whether a given feature is available, nor
> even one that tests the version of makeinfo that is processing the
> file.
>
> This forces any real-world project to avoid using the newly introduced
> features completely, until enough years pass after their introduction,
> because telling the end users to install the latest Texinfo is not a
> practical option.
>
> So perhaps we should introduce a facility for such tests, and
> preferably in a way that is itself backward-compatible, e.g., testable
> with @ifset or some such.

Would you or anybody else like to design and/or implement such a facility?