PyQt4 over ssh X-forwarding

[iguana]

I know I'm a bit behind with my monthly updates (August was a big month and I have been busy throughout September too) but I like noting down code help things as-and-when.

So, I have a PyQt4 application (and presumably this is an issue for a regular Qt program too) that doesn't like being X-forwarded - I just get a grey window that never renders, and the following errors on the console. xclock and xeyes work fine.

X Error: BadAccess (attempt to access private resource denied) 10
  Extension:    130 (MIT-SHM)
  Minor opcode: 1 (X_ShmAttach)
  Resource id:  0x1e0000b
X Error: BadShmSeg (invalid shared segment parameter) 128
  Extension:    130 (MIT-SHM)
  Minor opcode: 3 (X_ShmPutImage)
  Resource id:  0x1e0000a

Turns out I had to tell Qt to use the "native" (X11) graphics system:

QT_GRAPHICSSYSTEM=native DISPLAY=:10 python curses_smels.py

Apparently this needs Qt 4.7 minimum.