Missing Dependency: libmysqlclient.so.15(libmysqlclient_15)


Well-Known Member
Apr 14, 2004
I get this in a cpanel update is this anything to be concerned about

I tried to install manually but it needed dependencies and didnt want to proceed any firther if it isnt needed

WHM 11.1.0 cPanel 11.4.18-R14158
FEDORA 6 i686 - WHM X v3.1.0


Nov 7, 2010
I am having the exact same issue...

When I try to run /scripts/installzendopt I get this:

[email protected] [/home/cantport_backup/public_html]# /scripts/installzendopt
Installing Zendopt
Determining PHP version
Installing Zend Optimizer binary
No Zend Optimizer binaries available for this version of PHP!
Determining PHP version
Could not determine PHP version from output:
/usr/local/php4/bin/php: error while loading shared libraries: libmysqlclient.so.15: cannot open shared object file: No such file or directory
I think it is the exact same problem, that libmysqlclient.so.15 file is missing as of the last update...

I just checked, and the only one I have is libmysqlclient.so.16, which I would assume is a newer version?

CPanel staff may want to look at this, it would affect every single CPanel server I am sure...

Psychodreams: What exactly did you do to try to install it manually?

[edit] I later found this posting here: http://forums.fedoraforum.org/showpost.php?p=1238090&postcount=2 which says:
The mysql version on F11 has been upgraded. You need to wait for zend to update their packages or install from source.
I'm sure that the update of MySQL on ES1 has caused this... can any CPanel staff confirm my theory that we need to wait for a zend update?[/edit]
Last edited:


Well-Known Member
Sep 25, 2007
You don't need to wait for a zend update but you will need to either recompile php or downgrade mysql. Php was compiled against version mysql version 5.0.x but it was upgraded to mysql version 5.1.x. Using easyapache to recompile php will fix it. Just make sure mysql support is enabled.