[BRLTTY] Unable to build latest master

[Sebastian Humenda]

Hi,

I'm unable to build the latest master of BRLTTY on my Debian testing system. It
gives the error:

    error: #error regular expression package not selected

Briefly scanning through `./configure --help`, I couldn't find a way to select
the package to use. The build output is attached.
Is this a bug or a feature? :)

Thanks
Sebastian
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