for i in `find -name 'Config*' -o -name 'Makefile*' -o -name '*.mk'`; do sed -i 's/ \+$//' $i; done
'default n' is the default, so there's no need to say it explicitly.
quite work yet for me, but this clearly is a huge project and not having it quite work on the first pass is hardly unexpected. We definately want this stuff in buildroot.