a query on make file

Dear sir,
As soon as i try to run the make file...
commands:

$ 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

In make file:
check_fw:
    @echo -n "Checking for firewall compatibility: "
    *@bin/detect-fw.sh bin* || ( echo "Can't seem to find supported firewall
software. Check your path?" && exit 255 )

Can u explain me this peace of code in the make file..