I cannot upgrade openssl-stablr

[em.conti at tin.it]

Hi all, this is the first time I post to this list.
If I am wrong, sorry.
I have been trying for three weeks to update openssl-stable, but I
cannot beacause of this message:

===>  Cleaning for openssl-stable-0.9.7k
#
# this ports conflicts with your base system
# please undefine OPENSSL_OVERWRITE_PORT
# and use WITH_OPENSSL_BASE=yes instead.
#
*** Error code 1

I do not know how to act.

Bye
Emilio