bug#20858: 25.0.50; Strange messages in the output of 'autogen.sh' (from MSYS2 bash)

[Glenn Morris]

Dani Moncayo wrote:

> Running 'autoreconf -fi -I m4' ...
> main::scan_file() called too early to check prototype at
> /usr/bin/aclocal-1.11 line 644.
> Unescaped left brace in regex is deprecated, passed through in regex;
> marked by <-- HERE in m/\${ <-- HERE ([^ \t=:+{}]+)}/ at
> /usr/bin/automake-1.11 line 4159.

Presumably you get exactly the same if you just run

    autoreconf -fi -I m4

So this is an issue with your autotools installation, and nothing to do
with Emacs.