symbol lookup error: /usr/lib64/ undefined symbol: xcb_wait_for_reply64

Olivier Fourdan fourdan at
Thu Jul 30 23:50:51 PDT 2015

Hi all,

Yeap, sorry, my fault, I helped Darryl off-list (didn't mean to keep it
off-list, I just replied but not replied-all)

For the record, Darryl had another copy of libxcb in /usr/local that was
taking precedence over the libxcb from the distribution, so the 64bit api
addition found in libxcb from el6 where not found/used by libX11.

Removing the other copy in /usr/local fixed the issue.


On 31 July 2015 at 03:17, Peter Hutterer <peter.hutterer at> wrote:

> On Thu, Jul 30, 2015 at 08:55:06AM -0400, Darryl Cook wrote:
> > I am getting the following error when i run any X app on linux server.
> > Server is running Redhat ES6 64 bit.   It started after patching the
> system
> > but I have no idea which patch may have caused the problem.   Anyone else
> > seen this?
> >
> > xclock: symbol lookup error: /usr/lib64/ undefined symbol:
> > xcb_wait_for_reply64
> looks like you'll need to update libxcb as well.
> Cheers,
>    Peter
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