Installing nocat from FBSD ports

Hi there,

I just run the fresh installation of FBSD 5.3

from the ports collection I found net/nocatauth-gateway and 
net/nocatauth-server.

Unfortunetelly I face two problems, they are :
+ both functions can not be installed on the same server. An error occur is :
# make install
===>  Installing for nocatauth-gateway-0.82_1
 
===>  nocatauth-gateway-0.82_1 conflicts with installed package(s):
      nocatauth-server-0.82_1
 
      They install files into the same place.
      Please remove them first with pkg_delete(1).
*** Error code 1
 
Stop in /usr/ports/net/nocatauth-gateway.
*** Error code 1
 
Stop in /usr/ports/net/nocatauth-gateway.
#

On Makefile, I did change NOCATDIR?= become nocat-auth for nocatauth-server 
and nocat-gw for nocatauth-gateway. But the same error still occurs.

+ Seems that net/nocatauth-gateway using pf rather than ipfw(2).
What is the advantages and disadvantages for ipfw(2), ipf and pf ?
If I prefer to use ipf or ipfw(2), how do I change it ?

BR

PD