I haven't built a groff since 1.23. When I did so today, the first step produced a query I hadn't seen in a groff build before.
$ ./bootstrap /bin/mv: overwrite '.gitignore'? I said "y" to this, and the result was that the top-level .gitignore file gained a "/build-aux" line at the top, before the first comment. The line "/build-aux/" (with the trailing slash), already in the file in the "artifacts expected in a clean tree" section, remained unaltered, so "/build-aux" now appears twice, once with the trailing slash and once without. This has no effect I could discern on the rest of the bootstrap or build.
