In order to support the AVR32 architecture, it's apparently necessary to use a more recent version of config.guess and config.sub (see the referenced Debian bug). Please could you update them from the GNU config project?
I've updated config.guess and config.sub to latest (2009-12-30 and 2010-01-22 respectively). It should be in the next snapshot.
Mass move of bugs RESOLVED->CLOSED following the release of openssh-5.5p1