[Mingw-users] ./config.guess: unable to guess system type (problem with uname.exe)

[Joan J. <joa...@ho...>]

The problem what I'm experiencing since a few days is that everytime I want to compile a package, in ./configure stage: ./config.guess doesn't guess i686-pc-mingw32.
checking build system type... ./config.guess: unable to guess system type

[...]
uname -m = xx
uname -r = 5.1
uname -s = WINNT
uname -v = 2600

That it seems wrong... in older compilations that I have done, in config.log, it shows:
uname -m = i686
uname -r = 1.0.11(0.46/3/2)
uname -s = MINGW32_NT-5.1
uname -v = 2009-07-11 17:46

How I change manually this values? Where uname.exe gets this information (to be able to edit it)? How I can return to default values?

When I run uname -m, now it shows xx, how I can restore i686?