When running a svn merge got this error at Apache error_log:

[Mon Aug 10 15:22:02 2009] [notice] Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8k DAV/2 Phusion_Passenger/2.2.4 SVN/1.6.2 mod_perl/2.0.4 Perl/v5.8.8 configured -- resuming normal operations
Can't make DBI com handle for DBD::Pg::db: unknown package.

This problem was already reported here http://www.redmine.org/boards/2/topics/2512 and here http://www.redmine.org/boards/2/topics/7593.

About your application's environment
Ruby version 1.8.6 (i686-linux)
RubyGems version 1.3.5
Rails version 2.1.2
Active Record version 2.1.2
Action Pack version 2.1.2
Active Resource version 2.1.2
Action Mailer version 2.1.2
Active Support version 2.1.2
Application root /var/www/redmine
Environment development
Database adapter postgresql
Database schema version 101

Subversion: 1.6.2

vhost conf:

                
                  DAV svn
                  SVNParentPath "/var/svn/"
                  SVNPathAuthz off

                  AuthType Basic
                  AuthName redmine
                  Require valid-user

                  PerlAccessHandler Apache::Authn::Redmine::access_handler
                  PerlAuthenHandler Apache::Authn::Redmine::authen_handler

                  RedmineDSN "dbi:Pg:dbname=redmine;host=localhost"
                  RedmineDbUser "redmine"
                  RedmineDbPass " "