Xlib: extension "RANDR" missing on display "/tmp/launch-zP0Uvj/:0".

Jeremy Huddleston jeremyhu at macports.org
Sun May 17 19:27:31 PDT 2009

It definitely is just a warning.  It occurs whenever an app tries to  
query the RANDR extension.  It notices that the extension is missing  
and disables whatever optional support it would've had for that  
extension.  gtk2 based applications will do this every time they  
start... probably any app that uses a toolkit higher level than libXt,  
libXaw, or motif will omit such a message.

On May 17, 2009, at 17:30, Ryan Schmidt wrote:

> On May 17, 2009, at 11:44, Vincent DIEMUNSCH wrote:
>> after an update to OS X 1.5.7 and of Solfege under MacPorts
>> I get the following error : Xlib:  extension "RANDR" missing on  
>> display "/tmp/launch-zP0Uvj/:0".
>> Do you know where it comes from and how to fix it ?
> I have read on this list before that this error message is only a  
> warning and can be ignored, but I don't know for sure.
> When do you get this message -- when running what program? Does that  
> program still work? If not, is the above message the only thing  
> that's printed, or is there more output you could show us?
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