pgsql.sh startup script

[Brook Milligan]

It seems that the postgresql rc.d startup scripts have the following
lines:

     # pgsql_home="/path/to/home" # path to pgsql database directory

     eval pgsql_home="~$pgsql_user"

I believe that the second of these unconditionally replaces the value
of $pgsql_home.  However, the previous comment suggests that one can
define the variable in rc.conf.

Should the redefinition be conditional on the value being empty?

Cheers,
Brook