[CentOS] perl question on CentOS

I'm trying to use nmap2nagios (a perl script) on CentOS, but when I
run it, I get the following error:

(If this is offtopic for this list, please let me know)

./nmap2nagios.pl -v -r /tmp/nmap.xml -o /tmp/new.cfg

./nmap2nagios.pl: line 9: use: command not found
./nmap2nagios.pl: line 10: use: command not found
./nmap2nagios.pl: line 11: use: command not found
./nmap2nagios.pl: line 14: use: command not found
./nmap2nagios.pl: line 15: ::Dumper::Indent: command not found
./nmap2nagios.pl: line 16: ::Dumper::Maxdepth: command not found
./nmap2nagios.pl: line 18: use: command not found
./nmap2nagios.pl: line 19: use: command not found
./nmap2nagios.pl: line 20: use: command not found
./nmap2nagios.pl: line 22: use: command not found
./nmap2nagios.pl: line 24: use: command not found
./nmap2nagios.pl: line 26: my: command not found
./nmap2nagios.pl: line 29: syntax error near unexpected token `='
./nmap2nagios.pl: line 29: ` $data_ref->{'Path'}) = fileparse($0);'
[root at localhost nmap2nagios-0.1.2]#

When I type in "perl" before the command, I get this:

[root at localhost nmap2nagios-0.1.2]# perl nmap2nagios.pl -v -r
/tmp/nmap.xml -o /tmp/new.cfg

Can't locate XML/Simple.pm in @INC (@INC contains:
/usr/lib/perl5/5.8.5/i386-linux-thread-multi /usr/lib/perl5/5.8.5
/usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.3/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.1/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl/5.8.4
/usr/lib/perl5/site_perl/5.8.3 /usr/lib/perl5/site_perl/5.8.2
/usr/lib/perl5/site_perl/5.8.1 /usr/lib/perl5/site_perl/5.8.0
/usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.4/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.3/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.2/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.1/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl/5.8.4
/usr/lib/perl5/vendor_perl/5.8.3 /usr/lib/perl5/vendor_perl/5.8.2
/usr/lib/perl5/vendor_perl/5.8.1 /usr/lib/perl5/vendor_perl/5.8.0
/usr/lib/perl5/vendor_perl .) at nmap2nagios.pl line 24.
BEGIN failed--compilation aborted at nmap2nagios.pl line 24.
[root at localhost nmap2nagios-0.1.2]#