The oldest Perl I write my code to be compatible with is:

• Perl 6 - I live on the edge!
• Perl 5.10 - Features trump backwards compatibility.
• Perl 5.8 - It's the largest target to hit.
• Perl 5.6 - Change Management won't let us upgrade
• Perl 5.0-5.5 - I'm not paranoid, I'm realistic!
• Perl 4.0 - Have you heard about this CGI thing? Crazy!
• Perl pre-4.0 - If I can't run it on System V, I don't need it.

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