I am unable to compile opendbx, if I issue the command rpmbuild -ta opendbx-1.0.3.tar.gz it fails with the following mesasges
checking for mysql_init in -lmysqlclient_r... no checking for mysql_init in -lmysqlclient... no configure: error: mysql library (libmysqlclient) not found error: Bad exit status from /var/tmp/rpm-tmp.40942 (%build)
It's likely looking in /usr/include/mysql and /usr/lib/mysql/* for linking.
mysqlclient1X-devel packages put things in usr/include/mysql[3,4] and /usr/lib/mysql[3,4]. You may need to adjust the configure/make information accordingly, or see if powerDNS has packages for fedora/rhel.