# if you've want to use mysql5.5 you need to updgrade mysql and mysqllibs:
yum install mysql.`uname -i` yum-plugin-replace --assumeyes
yum replace mysql-libs --replace-with mysql55-libs --assumeyes

# switch to specific perl
perlbrew use perl-5.18.4

# start interactive CPAN shell
perl -MCPAN -e shell

# type in console:
install DBD::mysql