Frameworks/libpurple.framework/Versions/0.6.0/Headers/libymsg.h
2009-08-08 libpurple from im.pidgin.adium @ 95e1a9a37 (2.6.0mtn)
2009-07-11 im.pidgin.adium at 534ffccfd244372a8f2569168b1bc15b8c9d9054, which separates out Yahoo into 2 protocols (JP, regular). Neither currently connect.