Comment 3 for bug 813388

Andrew, few more info:

$ ls -l /usr/lib64/libmysqlclient*
lrwxrwxrwx 1 root root 26 Jul 14 20:08 /usr/lib64/libmysqlclient_r.so -> libmysqlclient_r.so.15.0.0
lrwxrwxrwx 1 root root 26 Jul 20 09:05 /usr/lib64/libmysqlclient_r.so.15 -> libmysqlclient_r.so.15.0.0
-rwxr-xr-x 1 root root 2135504 Feb 17 22:14 /usr/lib64/libmysqlclient_r.so.15.0.0
lrwxrwxrwx 1 root root 17 Jul 14 20:08 /usr/lib64/libmysqlclient_r.so.18 -> libmysqlclient.so
lrwxrwxrwx 1 root root 17 Jul 14 20:08 /usr/lib64/libmysqlclient_r.so.18.0.0 -> libmysqlclient.so
lrwxrwxrwx 1 root root 24 Jul 14 20:08 /usr/lib64/libmysqlclient.so -> libmysqlclient.so.15.0.0
lrwxrwxrwx 1 root root 24 Jul 14 20:08 /usr/lib64/libmysqlclient.so.15 -> libmysqlclient.so.15.0.0
-rwxr-xr-x 1 root root 2128552 Feb 17 22:14 /usr/lib64/libmysqlclient.so.15.0.0
lrwxrwxrwx 1 root root 22 Jul 20 08:50 /usr/lib64/libmysqlclient.so.18 -> libmysqlclient_r.so.15
-rwxr-xr-x 1 root root 3509232 Jul 2 06:17 /usr/lib64/libmysqlclient.so.18.0.0

$ rpm -qa | egrep -i '(percona|mysql)'
percona-release-0.0-1
Percona-Server-devel-55-5.5.13-rel20.4.138.rhel5
Percona-SQL-shared-50-5.0.92-b23.85.rhel5
Percona-Server-client-55-5.5.13-rel20.4.138.rhel5
php53-mysql-5.3.3-1.el5_6.1
Percona-Server-shared-55-5.5.13-rel20.4.138.rhel5
Percona-Server-server-55-5.5.13-rel20.4.138.rhel5

$ rpm -ql Percona-SQL-shared-50-5.0.92-b23.85.rhel5
/usr/lib64/libmysqlclient.so
/usr/lib64/libmysqlclient.so.15
/usr/lib64/libmysqlclient.so.15.0.0
/usr/lib64/libmysqlclient_r.so
/usr/lib64/libmysqlclient_r.so.15
/usr/lib64/libmysqlclient_r.so.15.0.0

Tried also this:
yum remove Percona-SQL-shared-50-5.0.92-b23.85.rhel5
yum install Percona-Server-shared-compat

But mydumper compiles always against libmysqlclient_r.so.15 (that is still the predefined one):
$ ls -l /usr/lib64/libmysqlclient*
lrwxrwxrwx 1 root root 26 Jul 14 20:08 /usr/lib64/libmysqlclient_r.so -> libmysqlclient_r.so.15.0.0
lrwxrwxrwx 1 root root 26 Jul 20 10:21 /usr/lib64/libmysqlclient_r.so.12 -> libmysqlclient_r.so.12.0.0
-rwxr-xr-x 1 root root 262344 Jul 19 15:33 /usr/lib64/libmysqlclient_r.so.12.0.0
lrwxrwxrwx 1 root root 26 Jul 20 10:21 /usr/lib64/libmysqlclient_r.so.14 -> libmysqlclient_r.so.14.0.0
-rwxr-xr-x 1 root root 1239792 Jul 19 15:33 /usr/lib64/libmysqlclient_r.so.14.0.0
lrwxrwxrwx 1 root root 26 Jul 20 10:21 /usr/lib64/libmysqlclient_r.so.15 -> libmysqlclient_r.so.15.0.0
-rwxr-xr-x 1 root root 2136808 Jul 19 15:33 /usr/lib64/libmysqlclient_r.so.15.0.0
lrwxrwxrwx 1 root root 26 Jul 20 10:21 /usr/lib64/libmysqlclient_r.so.16 -> libmysqlclient_r.so.16.0.0
-rwxr-xr-x 1 root root 2157840 Jul 19 15:33 /usr/lib64/libmysqlclient_r.so.16.0.0
lrwxrwxrwx 1 root root 24 Jul 14 20:08 /usr/lib64/libmysqlclient.so -> libmysqlclient.so.15.0.0
lrwxrwxrwx 1 root root 24 Jul 20 10:21 /usr/lib64/libmysqlclient.so.12 -> libmysqlclient.so.12.0.0
-rwxr-xr-x 1 root root 253888 Jul 19 15:33 /usr/lib64/libmysqlclient.so.12.0.0
lrwxrwxrwx 1 root root 24 Jul 20 10:21 /usr/lib64/libmysqlclient.so.14 -> libmysqlclient.so.14.0.0
-rwxr-xr-x 1 root root 1231432 Jul 19 15:33 /usr/lib64/libmysqlclient.so.14.0.0
lrwxrwxrwx 1 root root 24 Jul 20 10:21 /usr/lib64/libmysqlclient.so.15 -> libmysqlclient.so.15.0.0
-rwxr-xr-x 1 root root 2130056 Jul 19 15:33 /usr/lib64/libmysqlclient.so.15.0.0
lrwxrwxrwx 1 root root 24 Jul 20 10:21 /usr/lib64/libmysqlclient.so.16 -> libmysqlclient.so.16.0.0
-rwxr-xr-x 1 root root 2148048 Jul 19 15:33 /usr/lib64/libmysqlclient.so.16.0.0
lrwxrwxrwx 1 root root 24 Jul 20 10:17 /usr/lib64/libmysqlclient.so.18 -> libmysqlclient.so.18.0.0
-rwxr-xr-x 1 root root 3509232 Jul 2 06:17 /usr/lib64/libmysqlclient.so.18.0.0