Rudder

Running rudder-server on an existing server with php5 installed, the php5 cron job executing every 30mins returns :

1. [ -x /usr/lib/php5/maxlifetime ] && [ -x /usr/lib/php5/sessionclean ] && [ -d /var/lib/php5 ] && /usr/lib/php5/sessionclean /var/lib/php5 $(/usr/lib/php5/maxlifetime)
   php5: /opt/rudder/lib/libdb-5.1.so: no version information available (required by php5)
   php5: /opt/rudder/lib/libdb-5.1.so: no version information available (required by php5)
   php5: /opt/rudder/lib/libdb-5.1.so: no version information available (required by php5)

Any idea ?
Linux distribution is latest wheezy 7.0.9 with php5 5.4.44-0+deb7u1