Question about postgresql 9 and pg_upgrade

[Alexander Pyhalov]

Hello.
All latest PostgreSQL ports has conflicts with  earlier versions. May 
this be corrected in some way (for example, modify CONFLICTS variable 
and  install each new PostgreSQL version in its own directory, e.g. 
${LOCALBASE}/postgresql/XX/, where XX is 90 , 91 and so on). This will 
allow us to use pg_upgrade to upgrade databases (it needs binary files 
from both new and old postgresql version).

How do you advise to solve this problem? Should we compile postgresql 
from sources and avoid using databases/postgresql*-server ports?
-- 
Best regards,
Alexander Pyhalov,
system administrator of Computer Center of South Federal University