I am writing some code using OpenGL, and when run under Xvfb on MacOS it dies, with the error message

X Error of failed request:  BadMatch (invalid parameter attributes)
   Major opcode of failed request:  1 (X_CreateWindow)
   Serial number of failed request:  17
   Current serial number in output stream:  19

I think MacOS uses the XFree86 version of Xvfb, but my first question is how 
can I tell for sure, and how do I determine which version I've got?

Xvfb on other platforms (including Cygwin, I normally work in Windows) is fine, 
but I've no idea how to tell version numbers.

Duncan Murdoch


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