Peculiar perl version issue

[Christopher Chavez]

> On Jun 12, 2019, at 4:47 PM, Bruce R Miller via macports-dev <macports-dev at lists.macports.org> wrote:
> 
> So, I tracked it down to the Makefile that perl's MakeMaker generates;
> an innocuous thing called "fixin" does that substitution.

Possibly related: it is a known issue in MakeMaker that `#!/usr/bin/env perl` in scripts will not get replaced; I wonder if module authors choose to just use `#!/usr/bin/perl` or `#!perl` as a result, even though those are the less ideal/portable choices. See https://github.com/Perl-Toolchain-Gang/ExtUtils-MakeMaker/issues/58

Christopher A. Chavez