there's no artica-roundcube in bin directory to install. i followed some topics and got a .tgz Archive you uploaded on the post but without success.
i get this error
/usr/share/artica-postfix/bin/artica-roundcube: error while loading shared libraries: libmysqlclient.so.15: cannot open shared object file: No such file or directory
libmysqlclient.so.15 is exist in /usr/lib64/mysql/libmysqlclient.so.15
i use Centos5.6-x86-64 and i think the bin file you've made is for 32bit OS.
could you do me favor and upload a correct version for X64 OS?