I noticed this in Configure: =============================== Perl can be built to take advantage of threads on some systems. To do so, Configure can be run with -Dusethreads. Note that Perl built with threading support runs slightly slower and uses more memory than plain Perl. The current implementation is believed to be stable, but it is fairly new, and so should be treated with caution. If this doesn't make any sense to you, just accept the default '$dflt'. ... Since release 5.6, Perl has had two different threading implementations, the newer interpreter-based version (ithreads) with one interpreter per thread, and the older 5.005 version (5005threads). The 5005threads version is effectively unmaintained and will probably be removed in Perl 5.10, so there should be no need to build a Perl using it unless needed for backwards compatibility with some existing 5.005threads code. =================================== References to "fairly new" and 5.10 are no longer correct. I believe the text should be updated. I'm not qualified to do so. My guess is there is other obsolete text in it.Thread Next