problem when make gateway

# make gateway
> Looking for gpgv...
> Checking for firewall compatibility: No supported firewalls detected! Check your path.
> Supported firewalls include: iptables, ipchains, ipf, pf.
> Can't seem to find supported firewall software. Check your path?
> make: *** [check_fw] Error 255


how to solve:

replace the contents of the original "detect-fw.sh" with below or look
for "Linux 2.4" and change it to "Linux 2.6". The script has not been
updated and is looking for Kernel ver 2.4 and you are using 2.6

#cd Nocatauth-X.X.X
#cd bin/
#nano detect-fw.sh ---make change