OS X seems to depend on how it's called. 

$ perl -le 'print $^X'
perl
$ /usr/bin/perl -le 'print $^X'
/usr/bin/perl
$ perl -v

This is perl, v5.8.6 built for darwin-thread-multi-2level
...

[download]

Update: Unless of course you meant you need this specifically from people running 5.9.4 (which wasn't clear) . . .

In reply to Re: Poll: Is your $^X an absolute path? by Fletch
in thread Poll: Is your $^X an absolute path? by xdg

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