ouch!
i was asleep, at 3AM, when i edited the issue
and didn't really know what i was doing.
i just see that i removed, instead of edited the
mathmodule.diff and didn't check after.
so here it is again, with the url for original code
added.

if you want to test the erf, erfc, lgamma and gamma
please use this mathmodule.diff and the math_private.h header

the other diffs are incomplete and don't work, unless you have
erfs and gammas functions implemented in your platform.
i'll try to work on these files this weekend and
will rename tgamma to gamma.