Here's a patch that I discussed recently on pg95-dev that changes the

way one creates a database system.  Parts that were in "make install"
are not either in "make all" or initdb.  Nothing goes in the PGDATA
directory besides user data.  Creating multiple database systems is
easier.

In addition to applying the patch, it is necessary to move the file
libpq/pg_hba to backend/libpq/pg_hba.sample.

Submitted by: Bryan Henderson <bryanh@giraffe.netgate.net>