FreeBSD build errors: libtool: link: `/usr/local/lib/libxcb-xlib.la' is not a valid libtool archive

I've tried to update a server recently, and I got stuck on build errors for many X11 related packages, with the following message:

libtool: link: `/usr/local/lib/libxcb-xlib.la' is not a valid libtool archive

Of course, I've missed reading /usr/ports/UPDATING, where I could find that on 2009-01-23:

Libxcb shared library version was bumped from 1 to 2. You need to
rebuild any consumer of libxcb.so.1 or some applications will be
linked against two versions of libxcb once libX11 is upgraded.

For portupgrade users:

# portupgrade -rf libxcb