[oe] Regexp substitution in a bb file

[Arkaitz]

Hi,
I need to subsitute some things in the code of a package(coreutils)
and i don't know exactly where to put it.
My first choice is to create a do_configure () in the
coreutils_5.3.0.bb file that contains a
sed -i 's/__memcpy/memcpy/g' files* but i don't know if it is the best option.
Should i put it better in the coreutils.inc? and what is the do_configure for?
Thanks
-- 
Arkaitz