What happen to the VARATT_SIZEP macro in version 8.3?

Hello all,

I have C code which defines some user defined postgres functions. This
code has been used with Postgres version 7.4 and it uses the
VARATT_SIZEP macro.

I updated to Postgres version 8.3 and attempted to compile my C code and
noticed that the VARATT_SIZEP macro (which my code uses) no longer is
defined in the 8.3 code base (which needless to say prevents my code
from compiling). The macro use to be defined in postgres.h in version
7.4.

What replaces the VARATT_SIZEP macro in version 8.3? I have spent a long
time checking the documentation and have not found the answer.

Thanks

P.S.

I posted this question to the wrong mailing list earlier and meant to
post it to this list. I apologize to the people who are on both lists
that got this message twice.