perl 5.24 fibonacci

https://fengmk2.github.io/blog/2011/fibonacci/nodejs-python-php-ruby-lua.html

% which python2.7
/opt/local/bin/python2.7
% python2.7 -V
Python 2.7.11
% time python2.7 fib.py
102334155
python2.7 fib.py  61.28s user 0.34s system 98% cpu 1:02.31 total

% which ruby
/Users/bokutin/.rbenv/shims/ruby
% ruby -v
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.4.0]
% time ruby fib.rb
102334155
ruby fib.rb  21.19s user 0.18s system 98% cpu 21.688 total

% which perl
/Users/bokutin/perl5/perlbrew/perls/perl-5.16.2/bin/perl
% perl -v | grep version
This is perl 5, version 16, subversion 2 (v5.16.2) built for darwin-thread-multi-2level
% time perl fib2.pl
102334155
perl fib2.pl  99.35s user 0.57s system 98% cpu 1:41.72 total

% which perl5.24.0
/Users/bokutin/perl5/perlbrew/perls/perl-5.24.0/bin/perl5.24.0
% perl5.24.0 -v | grep version
This is perl 5, version 24, subversion 0 (v5.24.0) built for darwin-2level
% time perl5.24.0 fib2.pl
102334155
perl5.24.0 fib2.pl  78.93s user 0.34s system 99% cpu 1:19.75 total

% cat fib2.pl
sub fibonacci {
    return $_[0] if $_[0] < 2;
    return fibonacci($_[0] - 2) + fibonacci($_[0] - 1);
}
print fibonacci(40), "\n";