Can’t locate Sort/Naturally.pm in @INC (you may need to install the Sort::Naturally module) (@INC contains: /path/to/something /etc/perl /usr/local/lib/perl/5.18.2 /usr/local/share/perl/5.18.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.18 /usr/share/perl/5.18 /usr/local/lib/site_perl .) at (eval 145) line 2.
BEGIN failed–compilation aborted at (eval 145) line 2.

To fix this, in ubuntu 14.04, just type:

sudo apt-get install libsort-naturally-perl