All software packages except strongswan-4.4.0 can be installed via distribution package. libstrongswan: strongswan-4.4.0 http://strongswan.org/ http://download.strongswan.org/strongswan-4.4.0.tar.bz2 swig-1.3 http://swig.org/ http://sourceforge.net/projects/swig/files/swig/swig-1.3.40/ Perl modules: (via CPAN or distribution package) IO::Socket::SSL HTTP::Daemon::SSL RPC::XML Python modules: m2crypto GNU Readline library: readline-6.2 YAP 6.2.2 Prolog system: http://www.dcc.fc.up.pt/~vsc/Yap/yap-6.2.2.tar.gz (configure with --enable-dynamic-loading) Flex: http://sourceforge.net/projects/flex/files/flex/flex-2.5.35/flex-2.5.35.tar.gz GNU Bison: http://ftp.gnu.org/gnu/bison/ BUILDING ON UBUNTU The following is a complete list of packages required in order to build from git on Ubuntu (tested on version 10.04): autoconf-archive automake g++ git-core libgmp3c2 libgmp3-dev libio-socket-ssl-perl libhttp-daemon-ssl-perl librpc-xml-perl libssl-dev libtool python-dev swig BUILDING ON FREEBSD The following is a list of ports necessary to build from git on FreeBSD (tested on version 7.3): math/gmp devel/autoconf-archive