The meta-minnow layer does not support current master (1.8) and is unlikely to be updated moving forward. It currently fails on the autobuilder and should be removed (the layer and the MACHINE) from the current configuration.
http://git.yoctoproject.org/cgit/cgit.cgi/yocto-autobuilder/commit/?id=6ab25fdd629ef1f62bf0947a471cb222d08921a0