[root@test5 ~]# cat /etc/redhat-release 
CentOS release 5 (Final)
[root@test5 ~]# rpm -qa|grep mysql
mysql-5.0.22-2.2.el5_1.1
mysqltcl-3.03-0
[root@test5 ~]# yum search mysqltcl
Loading "installonlyn" plugin
Setting up repositories
sguil                     100% |=========================|  951 B    00:00     
extras                    100% |=========================| 1.1 kB    00:00     
updates                   100% |=========================|  951 B    00:00     
base                      100% |=========================| 1.1 kB    00:00     
addons                    100% |=========================|  951 B    00:00     
Reading repository metadata in from local files
primary.xml.gz            100% |=========================| 8.6 kB    00:00     
################################################## 26/26
primary.xml.gz            100% |=========================|  96 kB    00:08     
################################################## 325/325
primary.xml.gz            100% |=========================| 192 kB    00:04     
################################################## 348/348



mysqltcl.i386                            3.03-0                 sguil           
Matched from:
mysqltcl
Mysqltcl is an extension to the Tool Command Language (Tcl) that
provides high-level access to a MySQL database server.
http://www.xdobry.de/mysqltcl



mysqltcl.i386                            3.03-0                 installed       
Matched from:
mysqltcl
Mysqltcl is an extension to the Tool Command Language (Tcl) that
provides high-level access to a MySQL database server.

http://www.xdobry.de/mysqltcl
[root@test5 ~]# rpm -ql mysql|grep client
/usr/lib/mysql/libmysqlclient.so.15
/usr/lib/mysql/libmysqlclient.so.15.0.0
/usr/lib/mysql/libmysqlclient_r.so.15
/usr/lib/mysql/libmysqlclient_r.so.15.0.0
[root@test5 ~]# rpm -q --requires mysqltcl
libc.so.6  
libc.so.6(GLIBC_2.0)  
libc.so.6(GLIBC_2.1.3)  
libmysqlclient.so.15  
libmysqlclient.so.15(libmysqlclient_15)  
mysql  
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rtld(GNU_HASH)  
tcl >= 8.3.1