Running aimport against the bkcvs export  of the linux kernel raise the following error:
$ aeimport -lib /tmp/test-lib -dir /tmp/l25 -p l25 bkcvs/linux-2.5
aeimport: reading history files to learn when each file was changed and by whom...
aeimport: bkcvs/linux-2.5/drivers/usb/usb-skeleton.c,v: unable to work out what you meant to say
 available via rsync from rsync://rsync.kernel.org/pub/scm/linux/kernel/bkcvs