[Bug 745804] flex fails to build on Windows

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745804

--- Comment #20 from Philippe Renon <philippe_renon at yahoo.fr> ---
Hi Sebastian,

Could you share how you setup your MinGW/Msys environment.
I must be doing something wrong.

In addition to the m4.exe crashes, I also have issue with autoreconf.
Running autoreconf in any source directory yields:

Utilisateur at ASUS-SEVEN-PC
~/cerbero/sources/windows_x86/gst-plugins-ugly-1.0-1.5
$ autoreconf
configure.ac:1: error: Autoconf version 2.69 or higher is required
configure.ac:1: the top level
autom4te-2.68: /bin/m4 failed with exit status: 63
aclocal-1.11: /mingw/bin/autom4te-2.68 failed with exit status: 63
autoreconf-2.68: aclocal failed with exit status: 63

I believe it is due to having MinGW autoreconf present.

Utilisateur at ASUS-SEVEN-PC
~/cerbero/sources/windows_x86/gst-plugins-ugly-1.0-1.5
$ which autoreconf
/mingw/bin/autoreconf

Utilisateur at ASUS-SEVEN-PC
~/cerbero/sources/windows_x86/gst-plugins-ugly-1.0-1.5
$ autoreconf --version
autoreconf (GNU Autoconf) 2.68

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