Supporting threads imposes a (supposedly 10%) performance penalty on Perl (even when threads aren't being used). As such, supporting them is optional. Your build of Perl was compiled without support. You need to build Perl with thread support. The earlier posts are instructions on how to do so.

In reply to Re: where are my ithreads? by ikegami
in thread where are my ithreads? by 7stud

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