Package ordering

[Peter Bowen <pzb scyld com>]

Is there any way to get RPM to have a specific order for two packages
without putting either an Obsoletes, Requires, or PreReq tag in the spec
files?  

I have a package that tests whether a file exists and is writable in the
%post script, but it works fine if the file doesn't exist.  This is fine
when installing a single package, but if I'm installing a bunch,
including the one that provides the file in question, there seems to be
no guarantee of the order they are installed.  Would using Conflicts
affect the file ordering, or is there no good way to do it?

Thanks.
Peter