Dear forum,
I found the appropriate manual page for NetBSD detailing the various compat options
Quote:
Compatibility Options
options COMPAT_09
Enable binary compatibility with NetBSD 0.9. This enables support for
16-bit user, group...getdomainname(3),
setdomainname(3), and uname(3) syscalls. This option also allows using
numeric file system identifiers rather than strings. Post NetBSD 0.9
versions use string identifiers.
...
etc...
options COMPAT_43
Enables compatibility with 4.3BSD. This adds an old syscall for
lseek(2)...support for some older pre
4.4BSD socket calls.
etc...
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http://netbsd.gw.com/cgi-bin/man-cgi...s+4+NetBSD-5.1