This document describes various features of FreeBSD that will affect
       how Perl version 5 (hereafter just Perl) is compiled and/or runs.

   FreeBSD core dumps from readdir_r with ithreads
       When perl is configured to use ithreads, it will use re-entrant library
       calls in preference to non-re-entrant versions.  There is a bug in
       FreeBSD's "readdir_r" function in versions 4.5 and earlier that can
       cause a SEGV when reading large directories. A patch for FreeBSD libc
       is available (see
       ) which has been integrated into FreeBSD 4.6.

   $^X doesn't always contain a full path in FreeBSD
       perl sets $^X where possible to a full path by asking the operating
       system. On FreeBSD the full path of the perl interpreter is found by
       using "sysctl" with "KERN_PROC_PATHNAME" if that is supported, else by
       reading the symlink /proc/curproc/file. FreeBSD 7 and earlier has a bug
       where either approach sometimes returns an incorrect value (see ).  In these cases
       perl will fall back to the old behaviour of using C's argv[0] value for

       Nicholas Clark <>, collating wisdom supplied by Slaven
       Rezic and Tim Bunce.

       Please report any errors, updates, or suggestions to

perl v5.18.2                      2013-11-04                    PERLFREEBSD(1)
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