[Zope] Can't locate PyObject_SetItem

[Jonathan Hobbs]

I am trying to track down the cause of a performance problem in ZCTextIndex
(OkapiIndex is the leading contender - thanks to Dieter to for the tip!) and
have gotten as far as the 'score' routine in okascore.c - which references a
routine called 'PyObject_SetItem', for which I cannot locate the source
routine.  Does anyone know where the source for the 'PyObject_xxx' routines
are stored (linux installation)?

Thanks in advance,

Jonathan