Directly from the Camel book, 3rd edition, page 488:

#!/bin/sh -- -*- perl -*- -p
eval 'exec perl -S $0 ${1+"$@"}'
  if 0 ;
[download]

That is: run a (shell) eval and let the shell execute perl wherever it is in your $PATH

Ciao!
--bronto

---

The very nature of Perl to be like natural language--inconsistant and full of dwim and special cases--makes it impossible to know it all without simply memorizing the documentation (which is not complete or totally correct anyway).
--John M. Dlugosz