#!/app/perl/5.8.1/bin/perl
printf "Hello, World!\n";

##</code><code>##

ln -s /app/perl/5.8.1/bin/perl /home/foobar/current_perl

A script example:
#!/home/foobar/current_perl
printf "Hello, World!\n";

##</code><code>##

#!/usr/bin/env perl
printf "Hello, World!\n";

##</code><code>##

ln -s /app/perl/5.8.1/bin/perl /vobs/foobar/current_perl

##</code><code>##

#!/vobs/foobar/perlwrapper
printf "Hello, World!\n";