Help debugging GLXUnsupportedPrivateRequest failure

[Alex Villací­s Lasso]

I downloaded a trial version of a Japanese RPG (Vagrants from Studio 
e.go, at http://210.138.120.57/download/extra/vagrants_trial.exe), and 
tried to run it under Wine. This is a self-extracting archive, and it 
decompresses correctly, but when the main executable (vagrants.exe) is 
run, I get the following error:

trace:d3d:IWineD3DDeviceImpl_ActiveRender making new buffer
X Error of failed request:  GLXUnsupportedPrivateRequest
  Major opcode of failed request:  143 (GLX)
  Minor opcode of failed request:  16 (X_GLXVendorPrivate)
  Serial number of failed request:  9274
  Current serial number in output stream:  9276

I could pinpoint the exact location of the call that fails. The line is 
dlls/wined3d/device.c, line 5592, at the call to glXMakeCurrent() in 
IWineD3DDeviceImpl_ActiveRender. But I am at a loss a how to fix this on 
my own. The function aborts the program instead of returning an error, 
as the code intends to check, so it cannot even recover from it. From 
what I googled, this seems to be some missing functionality of my X 
server (in Fedora 4), but there is no more information on how to fix 
this. Could somebody explain this error in more detail, and what can I 
do to aid in diagnosing or fixing it?

Using latest Wine CVS (at 2005/07/29).

Alex Villacis Lasso