[bug #66438] configure fails on macOS since 180d665d19

[Sven Schober]

Follow-up Comment #10, bug #66438 (group groff):


> To quote the brackets the shell command needs to see.

Thank you for clearing that up to me! I did not think about the m4 context,
_and_ I did not think of `[`and `]` being m4's quote characters.

> I don't remember if POSIX character classes are valid in BREs, 

Yes, [1] (logical) page 102, section "7.3.5 Bracket Expression", Item 6. lists
them as BREs.

> But this intsance is still an Autoconf macro definition, so then, I suspect,
> the brackets would have to be tripled.

I see that now. Would be very unreadable, probably. I find m4's choice of
quotation syntax... surprising? Unusual? I don't know, anyway, I have deep
respect, so do not want to judge here.

[1] https://pubs.opengroup.org/onlinepubs/009656599/toc.pdf


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