initdb creates a wrong-version database

Hello pgsql-admin,

  I have installed PostgreSQL 8.1.3 on Trustix Secure Linux
  When I have created the initial database with initdb
  and run postmaster, it says:
---------------------------
An old version of the database format was found.\nYou need to upgrade the data format before using P
ostgreSQL.\nSee /usr/share/postgresql-package/README.rpm.dist for more information.
---------------------------

 What is wrong? In the README I found no information about how to
 convert database format, just about migration data

 There was postgresql 7.4 libs in my /usr/lib directory (it is needed by
 php4), but no conflicts with names.

--
Best regards,
 Anton                          mailto:valinor@irfc.ru

Ekaterinburg, Russia