My perl installations typically lag some versions behind, mostly due to lazyness. On my servers, I run Slackware. Currently, that means Slackware 14.2 and Perl 5.22. (Yes, it's the system perl. Slackware does not use Perl, but it comes with perl. So messing with the system perl is ok on Slackware.) On Windows, I have some Strawberry Perl running, an old 5.14 installation at home, a slightly newer version at work (I think 5.2x), still running dmake (so less than 5.26).

Mentally, I am still mostly at v5.12: Perl 5 with say, s///r, and use VERSION implying strict. So I generally start my code (both scripts and modules) with:

use v5.12;
use warnings;
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Alexander