Current ones won't recognize DragonFly.
In projects/sample/configure.out
configure: error: cannot guess build type; you must specify one
Latest versions are afaict:
http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD
http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD
Regards,
Sascha