In my never-ending question to understand FreeBSD application management, I took note of this post to the freebsd-current mailing list:
From: Kris Kennaway (kris_at_obsecurity.org)
Date: Fri, 20 Feb 2004 16:59:48 -0800
I don't normally announce these here, but since there's recently been a "flag day" people may like to know that I've uploaded a full set of 9189 post-libpthread i386 5.2-CURRENT packages to ftp-master. You can use e.g. portupgrade -afPP to update your installed ports if you want to avoid the need to recompile everything that uses libc_r. Packages for other architectures will follow over the next week or so.