I don't know the answer to your question. I was assuming it has to do with the MYSQL server that's installed on this machine. I should clarify that I'm just one of a number of people who are trying to work together on this machine, so most of what's been done to this machine was not done by me. Is there a way that I can determine if I can remove this without affecting MySQL?
I get transaction conflict errors (2 of many are posted below):
file /usr/share/mysql/charsets/README from install of mariadb-libs-1:5.5.44-2.el7.centos.x86_64 conflicts with file from package MySQL55-server-5.5.47-1.cp1148.x86_64
where is this MySQL55-server-5.5.47-1.cp1148.x86_64 package from? Its not in the base or EPEL repositories... that package wants to put its files in the same locations as the base package mariadb uses, so its going to conflict with it. the postgis you're installing apparently depends on mariadb.
