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