You may get the error “Missing Dependency: libmysqlclient.so.15 is needed by package 2”  when installing some packages, eg, Postfix.

yum install postfix
Excluding Packages in global exclude list
Finished
Setting up Install Process
Resolving Dependencies
–> Running transaction check
—> Package postfix.i386 2:2.10.0-1.el5 set to be updated
–> Processing Dependency: libmysqlclient.so.15 for package: postfix
–> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15) for package: postfix
–> Finished Dependency Resolution
2:postfix-2.10.0-1.el5.i386 from CentALT has depsolving problems
–> Missing Dependency: libmysqlclient.so.15 is needed by package 2:postfix-2.10.0-1.el5.i386 (CentALT)
2:postfix-2.10.0-1.el5.i386 from CentALT has depsolving problems
–> Missing Dependency: libmysqlclient.so.15(libmysqlclient_15) is needed by package 2:postfix-2.10.0-1.el5.i386 (CentALT)
Error: Missing Dependency: libmysqlclient.so.15 is needed by package 2:postfix-2.10.0-1.el5.i386 (CentALT)
Error: Missing Dependency: libmysqlclient.so.15(libmysqlclient_15) is needed by package 2:postfix-2.10.0-1.el5.i386 (CentALT)
You could try using –skip-broken to work around the problem
You could try running: package-cleanup –problems
package-cleanup –dupes
rpm -Va –nofiles –nodigest
The program package-cleanup is found in the yum-utils package.

You have to install mysql-libs, and that will solve the dependency issues. Follow the steps given below.

wget -q -O - atomicorp.com/installers/atomic | sh
yum install mysql-libs
yum install postfix

That will resolve the issues.