bug#28601: 26.0.50; configure: error: Emacs does not support 'x86_64-pc-msys' systems.

[Noam Postavsky]

On Fri, Oct 13, 2017 at 10:09 AM, Vincent Belaïche
<vincent.belaiche@gmail.com> wrote:

> Please note that gcc -v makes this output even though my MSYSTEM envvar
> expands to MINGW64.
>
> I think that the objective of the gcc -v is to discriminate between 32
> and 64 bits, not between MINGW and MSYS. So, it seems that what we have
> is an autoconf bug. Am I wrong ?

I think it means you didn't install the mingw-w64-x86_64-toolchain
metapackage, so you are using the msys toolchain rather than the mingw
one.