should "-DHAVE_POOL_OF_THREADS" not be configureable? Manually-specified variables were not used by the project: HAVE_POOL_OF_THREADS cd /home/builduser/rpmbuild/BUILD/mariadb-5.5.33a/sql && /usr/bin/c++ -DHAVE_CONFIG_H -DHAVE_EVENT_SCHEDULER -DHAVE_OPENSSL -DHAVE_POOL_OF_THREADS -DMYSQL_SERVER ___________________________ IMHO that is a nice idea but in tests with typical PHP allications it slows things down, in case of applications like "dbmail" which have their own sql-connection-pooling it doe snot have benefits yes, you need to enable it in the my.cnf, but i am a fan of disable things at compile-time which are not used inside a known infrastructure and keep binaries as small as possible