Works on 5.8+: 

use v5.8.8;

[download]

Works on 5.6+: 

use 5.008_008;

[download]

Works on 5.0+: 

BEGIN {
   $] >= 5.008_008
      or die("Need half-decent Unicode support. "
         .   "Please use Perl 5.8.8 or higher\n");
}

[download]

I could be wrong as to when each started working.

In reply to Re: Portable way to require Perl 5.8.8 by ikegami
in thread Portable way to require Perl 5.8.8 by rovf

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