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

[Vincent DIEMUNSCH]

Hello,

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 ?

Thanks for your help

Regards,

Vincent