fix for missing PNG support?

[Joe VanAndel]

I'm trying to run dreampie, a new Python shell, on Snow Leopard, using
Python 2.6.  I'm using Gtk 2.18.7_0.

When I start dreampie, it prints:

GError: Couldn't recognize the image file format for file
'/opt/local/Library/Frameworks/Python.framework/Versions/2.6/share/pixmaps/dreampie.png'

The fix appears to be:
setenv XDG_DATA_DIRS /opt/local/share

(found on http://bbs.archlinux.org/viewtopic.php?id=57468)