Comment 2 for bug 490983

Nevermind... confirmed:

[root@centos5-2 ~]# rpm -qa | grep mysql
[root@centos5-2 ~]# echo $?

[root@centos5-2 ~]# yum install mysql51 mysql51-server
epel | 3.4 kB 00:00
aaad8b1e3323490e8d92b6c5cdea04f96263749b-primary.sqlite.bz2 | 2.7 MB 00:01
base | 2.1 kB 00:00
updates | 1.9 kB 00:00
primary.sqlite.bz2 | 320 kB 00:00
addons | 951 B 00:00
Could not retrieve mirrorlist http://dl.iuscommunity.org/mirrorlist?repo=ius-el5&arch=x86_64 error was
[Errno 14] HTTP Error 500: Internal Server Error
ius | 1.9 kB 00:00
primary.sqlite.bz2 | 91 kB 00:00
extras | 1.1 kB 00:00
Setting up Install Process
Parsing package install arguments
Resolving Dependencies
--> Running transaction check
---> Package mysql51.x86_64 0:5.1.41-1.ius.el5 set to be updated
--> Processing Dependency: mysqlclient15-devel for package: mysql51
--> Processing Dependency: mysqlclient15 for package: mysql51
---> Package mysql51-server.x86_64 0:5.1.41-1.ius.el5 set to be updated
--> Running transaction check
---> Package mysql50.x86_64 0:5.0.88-1.ius.el5 set to be updated
---> Package mysql50-devel.x86_64 0:5.0.88-1.ius.el5 set to be updated
--> Processing Conflict: mysql51 conflicts mysql < 5.1
--> Processing Conflict: mysql51 conflicts mysql50
--> Processing Conflict: mysql50 conflicts mysql51
--> Finished Dependency Resolution
mysql51-5.1.41-1.ius.el5.x86_64 from ius has depsolving problems
  --> mysql51 conflicts with mysql50
mysql50-5.0.88-1.ius.el5.x86_64 from ius has depsolving problems
  --> mysql50 conflicts with mysql51
Error: mysql51 conflicts with mysql50
Error: mysql50 conflicts with mysql51

This might be a regression with mysql50-5.0.88 .....