> But the user can also use the wrong script. I would prefer to set a variable
> in each of the packages (Makefile, +CONTENTS) marking it as "sys" or "pkgsrc"
> package and pkg_add etc. could figure out which PKG_DBDIR to take, if not
> told otherwise via command line.

I don't like the PKG_DBDIR environment... I think environment variable
is not suitable for a global configuration, which should be common in
a system and in theory need not to be variable among shells. How about
a global config file like /etc/package.conf?

Regards,
Masao