Further to Erez's comments above regarding changing the PATH, you can change the shebang line in scripts to the following:

#!/usr/bin/env perl
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This will setup the shebang correctly in your scripts depending on which perl executable is found in the PATH

Small test on a NetBSD system:

[canker:~]$ ls -l test.pl
-rwxr-xr-x  1 chris  users  35 Sep 17 11:52 test.pl
[canker:~]$ cat test.pl
#!/usr/bin/env perl

print "$]\n";
[canker:~]$
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With normal system PATH:

[canker:~]$ ./test.pl
5.008008
[canker:~]$
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Which an amended PATH:

[canker:~]$ PATH=/opt/perl-5.10.0/bin:$PATH ./test.pl
5.010000
[canker:~]$
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