sysinstall automatic partition labelling/sizing problem

[Nathan Butcher]

Automatic labelling on 7.0 created about 360MB for my root partition on
a 8GB disk. After a buildkernel into 7.1-PRERELEASE, the root partition
was exhausted during the installkernel.

Maybe automatic labelling in sysinstall needs to allocate more than
360MB in the root (/) partition if it's going to stay big enough to
accomodate a buildkernel and installkernel from source.