What is the best (portable) way to express that a Perl program requires 5.8.8 or later?

I tried 

require v5.8.8;

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but got a warning since this doesn't work with old Perl versions. For old versions, the version needs to be syntacically a number. I googled for examples, but did not find any for 5.8.8. I tried the following: 

require 5.008_008;

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This is syntactically correct, but I wonder whether I really pick the "right" Perl version with this expression.
-- 
Ronald Fischer <ynnor@mm.st>

In reply to Portable way to require Perl 5.8.8 by rovf

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