[Gm2] Cygwin64: Configuration x86_64-unknown-cygwin not supported

[Christoph Schlegel]

Hello,

now gm2 is building fine in a Cygwin32 environment -

I am trying to build gm2 under Cygwin64. I am running into problems right at 
the start when trying to configure the 
build. This is the original message:

*** Configuration x86_64-unknown-cygwin not supported
Makefile:3824: recipe for target 'configure-gcc' failed
make[1]: *** [configure-gcc] Error 1

I tried the option --build=x86_64 (as suggested in some forum) but only got a 
similar message:

*** Configuration x86_64-pc-none not supported
Makefile:3820: recipe for target 'configure-gcc' failed
make[1]: *** [configure-gcc] Error 1

Then I tried to give a --target=x86_64-pc-cygwin option (which should only be 
needed for building a cross compiler):

*** Configuration x86_64-pc-cygwin not supported
Makefile:3824: recipe for target 'configure-gcc' failed
make[1]: *** [configure-gcc] Error 1

At last I updated the files config.guess and config.sub in the gcc-versionno 
directory as someone told me these are 
outdated in only slightly older releases of GCC. Did not work either -

So I have no idea how to get along...

Anyone?

Regards,
Christoph