Download link: http://irssi.org/download#sources

SHA256: 63ea70eb1ce6fb3c995e984f919dcd18882e916478779dd899de9385ef8fdf28  irssi-0.8.14.tar.bz2

Compile with Perl support and SSL: install libperl-dev and libssl-dev

$ tar jxf irssi-0.8.14.tar.bz2

$ cd irssi-0.8.14 

$ ./configure

[ ... ]

Building text frontend ........... : yes, using terminfo
Building irssi bot ............... : no
Building irssi proxy ............. : no
Building with module support ..... : yes
Building with Perl support ....... : static (in irssi binary)
Perl library directory ........... : (site default - /usr/local/lib/perl/5.10.0)
Install prefix ................... : /usr/local

Building with IPv6 support ....... : yes
Building with SSL support ........ : yes
Building with 64bit DCC support .. : yes
Building with garbage collector .. : no

$ make

