On Fri, 10 Dec 1999 23:11:57 -0500 (EST) 
 der Mouse <mouse@Rodents.Montreal.QC.CA> wrote:

 > > From this perspective, the "newest" a.out libraries aren't
 > > "compatible" with "old" NetBSD.  e.g. I can't really use libc.12.40
 > > instead of my libc.so.12.5 on an older version of NetBSD.
 > 
 > You can't?  Then a minor number bump is insufficient; the major number
 > should have been changed.

They might use a new system call.. but that has nothing to do with the
interface they present to applications.

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>