Warning about Log::Dispatch and unix dgram connect: Socket operation on non-socket

I started getting these errors when I recompiled mod_perl as a DSO outside
the Apache source tree on a Solaris 9 box running Perl 5.8.2 and

Turns out that Log::Dispatch defaults to inet as the default socket. By
adding socket => ‘unix’ after the stderr => 1 on line 234 in the RT.pm, the
errors went away.

I am still curious as to why this happened. With mod_perl compiled into
Apache running as a standalone, does this force the kind of system calls
that Log::Dispatch would otherwise use to be unix and not inet? Or is this
a Solaris 9 thing?

Thanks in advance.