Building Pen from source on NetBSD - UlricE/pen GitHub Wiki
NetBSD 6.1.5
export PKG_PATH=ftp://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/\`uname -p\`/\`uname -r\`/All/
pkg_add gcc
tar zxfv pen-0.27.1.tar.gz
cd pen-0.27.1
./configure
make
Test:
./pen -dfU 53 192.168.11.10:53
And from another host:
ulric@qvp2:~$ dig @netbsd +short siag.nu
194.9.95.65