When installed from CentOS release channels, package centos-release-SCL-6-5.el6.centos.x86_64 provides /etc/yum.repos.d/CentOS-SCL.repo which in turn ships (an outdated version of) scl-utils (scl-utils-20120927-8.el6.x86_64), so when one tries to install either mysql55-mysql-server or mariadb55, file /usr/bin/scl_source is requested as a dependency, and the install fails (see attachment for more details).
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