Bugzilla Bug 128102

Ebuilds for gnugk do not take into account configure --with-large-fdset[=MAXFD]
option. The compiled gnugk have default=1024 FD_MAX limit, therefore limiting
the number of open files and sockets.

part of configure output:
...
checking for /usr/share/pwlib/../openh323/version.h... yes
OpenH323 prefix set to /usr/share/pwlib/../openh323
checking for /usr/share/pwlib/../openh323/version.h... (cached) yes
OpenH323 version is 1.15.6
RADIUS support enabled
LARGE FDSET support disabled
...

This is fairly trivial to implement.  

Create portage overlay for gnugk and apply the following diff to the existing
ebuild then change version (I used -r5 but cannot remember why :$)

 diff -u /usr/local/portage/net-misc/gnugk/gnugk-2.2.3-r5.ebuild
/usr/local/portage/net-misc/gnugk/gnugk-2.2.3_p2.ebuild
--- /usr/local/portage/net-misc/gnugk/gnugk-2.2.3-r5.ebuild     2005-11-11
00:32:27.000000000 +0000
+++ /usr/local/portage/net-misc/gnugk/gnugk-2.2.3_p2.ebuild     2005-11-11
00:38:48.000000000 +0000
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/net-misc/gnugk/gnugk-2.2.3_p2.ebuild,v 1.1
2005/09/04 22:23:51 stkn Exp $

-IUSE="mysql postgres radius large"
+IUSE="large mysql postgres radius"

 MY_P=${P/_p/-}

@@ -24,7 +24,7 @@

 src_compile() {
        econf \
-               `use_with large "large-fdset=4096" ` \
+               `use_with large "large-fdset=4096"` \
                `use_enable mysql` \
                `use_enable postgres sql` \
                `use_enable radius` || die

I did this unconditional, thanks :)