All software packages except strongswan-4.6.4 can be installed via
distribution package.

libstrongswan:
    strongswan-4.6.4
        http://strongswan.org/
        http://download.strongswan.org/strongswan-4.6.4.tar.bz2

swig:
    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
    (Perl needs to be linked with a thread library, although need not
     to be threaded)


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

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 10.04,11.04,12.04):

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 pkgs necessary to build from ports on FreeBSD
(tested on version 8.2):
libxcb
freetype2
libSM
libX11
openjdk6
gettext
flex
gmp
p5-IO-Socket-SSL
p5-XML-RPC
perl-5.14.2_2
autoconf-wrapper-20091109
automake-wrapper-20091109
autoconf-2.69
automake-1.12.3
apache-ant

(tested on version 9.1):
openjdk6 
flex
perl (perl5.14.2)
load_r_pkg perl
p5-IO-Socket-SSL 
p5-XML-RPC
swig
automake


BUILDING ON MAC OS X 

(Thanks to Victor J. Orlikowski <vjo@duke.edu>)
The following is a list of pkgs necessary to build from MacPorts
vstr
swig
swig-python
swig-perl
swig-java
bison
flex
readline