What Perl version supports fork?

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I get the following message when I call fork in my code, The Unsupported function fork function is unimplemented at forktest.pl line 3. Can anyone help me in this? Following is my code,

sub test
{
  unless(fork)
  {
      exec " "
  }
}
&test
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