On Sun, Oct 4, 2015 at 8:56 AM, Eli Zaretskii <eliz@gnu.org> wrote:

> This all smells of file-name
> "transformations" done by MSYS when it invokes native programs, so
> please look around and see if some program/utility involved in this,
> besides Emacs, is not an MSYS program.  Then make sure its MSYS
> namesake is invoked instead.

Mystery solved. The make.exe being invoked wasn't the MSYS one. It was the
one from your EZWinPorts, which accidentally ended in the path.

Bootstrapping works now as expected.

Thanks,

     Juanma