From owner-freebsd-ports@FreeBSD.ORG  Thu Oct  7 12:52:35 2010
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Date: Thu, 07 Oct 2010 16:52:31 +0400
From: Alexander Pyhalov <alp@rsu.ru>
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Subject: new version of postgresql port
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Hello.
I've seen interesting commit message in postgresql90-server port: "Also, 
try to break the previous 1:1 relation between FreeBSD system and
PostgreSQL versions installed. Use different PREFIX:es to install
different versions on the same system."

I've fetched new version of ports and tried to install postgresql84 from 
ports with default prefix and later - postgresql90 with non-default prefix.

I managed to install postgresql90-client and 
postgresql84-{server,client}. However, while building 
postgresql90-server I received

pgtest# make PREFIX=/usr/local/postgresql/9.0 install
===>  postgresql-server-9.0.1 cannot install: the port wants 
postgresql90-client but you have postgresql84-client installed.
*** Error code 1

Stop in /usr/ports/databases/postgresql90-server.

The problem comes from 186 line of /usr/ports/Mk/bsd.database.mk. It 
must be modified to allow such things.
Also, it seems that PREFIX modification is not sufficient: we should 
have some specific postgresql files in /usr/local/etc/periodic and 
several startup scripts in /usr/local/etc/rc.d.

-- 
Best regards,
Alexander Pyhalov,
system administrator of Computer Center of South Federal University