installation on Debian 7.0 fails

root@minisql:~# apt-get install mariadb-server mariadb-server-5.5 mariadb-server-core-5.5 mariadb-client-5.5 mariadb-client libmariadbclient18 mariadb-client-core-5.5 libmysqlclient18

Reading package lists... Done
Building dependency tree
Reading state information... Done
libmysqlclient18 is already the newest version.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libmariadbclient18 : Depends: libmysqlclient18 (= 5.5.30-mariadb1~wheezy) but 5.5.30+dfsg-1.1 is to be installed
E: Unable to correct problems, you have held broken packages.