make buildworld runs out of space

[Bill Tillman]

I have built two machines with 8.0-STABLE-201002-amd64. When I updated the sources and ran make buildworld process it would fail claiming that / was full.
 
It seems to be running into the problem when the make installkernel portion of my script was running. Both machines were built using the default of 512M for /. I rebuilt the machines with 1G / and all was well. But one shouldn't have to do this as 512M for / should be adequate.