If this is of interestin to anyone I'd be happy to supply
the .config file as well.
buffer.c: In function `__buffer_error':
buffer.c:65: warning: implicit declaration of function `show_stack'
check.c: In function `devfs_register_partitions':
check.c:470: array subscript is not an integer
make[2]: *** [check.o] Error 1
make[1]: *** [partitions] Error 2
make: *** [fs] Error 2