How to find which perl was used to invoke script

tsk1979 has asked for the wisdom of the Perl Monks concerning the following question:

I have written a perl script, lets call it myscript.pl. It has lots of modules used, and sometimes customers do not have those modules installed. So a solution was adopted.
The software package(of which this script is a part) also provides a perl installation.
So I removed #!/usr/bin/perl from top of file, and changed use model to

$SOFTWARE_PATH/perl/bin/perl myscript.pl <option>
[download]

Now nothing stops user from doing

/usr/bin/perl myscript.pl
[download]

We don't want user to do that as the user installation may have older version of perl. So is there a way to check from inside myscript.pl, that what was the path from where perl was invoked? I searched google high and low, but could not find anything!
EDIT : I found it its $^X ! Went to a page with all perl special variables, theres quite a humongous list, and found this baby

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Re: How to find which perl was used to invoke script by laminee (Novice) on Aug 21, 2009 at 07:28 UTC
A line like `require 5.8.5;` would restrict users from executing the script with Perl version lower than specified.	[reply] [d/l]
Re: How to find which perl was used to invoke script by Boldra (Curate) on Aug 21, 2009 at 07:53 UTC
Great that you solved your own problem. Did you know you can get that page with all the special values by typing `perldoc perlvar` ? It's part of the standard perl documentation and available whenever perl is installed. And if you add the line `use English;` to the top of your program, you can call that variable `$EXECUTABLE_NAME` instead of the rather esoteric `$^X`. But if you do `use English`, it's a good idea to exclude some imports for performance. I have `use English qw<-no_match_vars>` in my template for new perl files. - Boldra	[reply]
Re^2: How to find which perl was used to invoke script by Anonymous Monk on Aug 21, 2009 at 07:58 UTC
Perl is esoteric. `use Chinese;` [download] Hey, it doesn't work :p	[reply] [d/l]
Re^3: How to find which perl was used to invoke script by Burak (Chaplain) on Aug 21, 2009 at 14:08 UTC
Hahhah :D that was good :)	[reply]