[rt-users] Pg - db initialisation failed

[mixo]

'make install ' for rt2 (2.0.15) and 'make initialize-database' for rt3 
(rt-3.0.0)
results in:
++++++++++++++++++++++++++++++++++++++++++
DBD::Pg::db do failed: ERROR:  CREATE DATABASE: may not be called in a 
transaction block at 
/usr/lib/perl5/site_perl/5.6.0/DBIx/DataSource/Driver.pm line 77, 
<STDIN> line 1.
ERROR:  CREATE DATABASE: may not be called in a transaction block at 
/usr/lib/perl5/site_perl/5.6.0/DBIx/DataSource/Driver.pm line 77, 
<STDIN> line 1.
make: *** [createdb] Error 2
++++++++++++++++++++++++++++++++++++++++++

And from my db logs I get:

    ERROR:  CREATE DATABASE: may not be called in a transaction block

What could be the cause of the problem and how can I solve it?