I made two thing so the istalation to pass on debian 5 /lenny:

1. canged temporary /etc/debian_version from 5.0 to 4.0

2.Runing this to downgrade perl. 10

#!/bin/bash

wget http://ftp.at.debian.org/debian/pool/main/p/perl/perl-modules_5.8.8-7etch6_all.deb
wget http://ftp.at.debian.org/debian/pool/main/p/perl/perl_5.8.8-7etch6_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/p/perl/perl-base_5.8.8-7etch6_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/p/perl/libperl5.8_5.8.8-7etch6_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/d/db4.4/libdb4.4_4.4.20-8_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/libs/libsocket6-perl/libsocket6-perl_0.19-1_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/libt/libterm-readkey-perl/libterm-readkey-perl_2.30-3_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/libl/liblocale-gettext-perl/liblocale-gettext-perl_1.05-1_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/libt/libtext-iconv-perl/libtext-iconv-perl_1.4-3_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/libt/libtext-charwidth-perl/libtext-charwidth-perl_0.04-4_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/libn/libnet-ssleay-perl/libnet-ssleay-perl_1.30-1_i386.deb
wget http://ftp.at.debian.org/debian/pool/main/libn/libnet-libidn-perl/libnet-libidn-perl_0.07-1_i386.deb


dpkg -i perl-modules_5.8.8-7etch6_all.deb perl-base_5.8.8-7etch6_i386.deb
        perl_5.8.8-7etch6_i386.deb libperl5.8_5.8.8-7etch6_i386.deb
        libdb4.4_4.4.20-8_i386.deb libsocket6-perl_0.19-1_i386.deb
        libterm-readkey-perl_2.30-3_i386.deb liblocale-gettext-perl_1.05-1_i386.deb
        libtext-iconv-perl_1.4-3_i386.deb libtext-charwidth-perl_0.04-4_i386.deb
        libnet-ssleay-perl_1.30-1_i386.deb libnet-libidn-perl_0.07-1_i386.deb