on my laptop (T60 / IBM thinkpad) and a gentoo-sources kernel 2.6.37, it seems that the file current_now is replaced by power_now.
i made a test :
--- #define CURRENT_NOW "current_now"
+++ #define CURRENT_NOW "power_now"
and now works good.
i'm not competent to bring you an enhanced patch, sorry.
if you want more information, let me now.