gnap for wrap with a cgi app

hi there,
i'm trying to develop a small firewall with gnap for wrap boxes 
(www.pc-engines.ch).

i want to config simple stuff like dhcp and ip's over a web interface.

which gnap version should i take? (i tried 2.0 for now)
did anyone sucessfully built a webserver with a cgi language?

i tried to build the haserl extensions from overlays but it always 
failed complaing about haserl being masked.
(i added www-apps/haserl ~x86 to portage_confdir/package.keywords)

what else should be considered?

thanks!
yannick