The file in question is wl_definitions.h, which is inside the arduino sketchbook/libraries/wifi/utility/ folder. I am using some "original" wifi library, not the one included in newer IDE that require irreversible wifi shield firmware upgrade.
How do I include this file in my projects that don't use the wifi library? I'm creating multiple network options for a project. One option is arduino wifi shield, and another is digi xbee wifi module. I want to use the same definition in xbee wifi code to be consistent.
I should have done it in the past (a few years seem like forever) but I forgot what I did (maybe even prior to IDE 1.0).