problem with ldconfig and xorg libraries

I have to recover from a particularly dumb thing that I did.  It's an
entertaining problem, so I'll see if I can lay it all out to you.

I run FreeBSD on two machine, "April" and July".  They are both 2
processor smp machines; April is i386, and the July machine is amd64.  I
often use x11 cross mounts, so I have to keep in mind what's my current
machine, else I will do what I just did.  In pkg_add, there's a
variable, PACKAGESITE, that lets you vector the place you get your
packages from, and I use this to set the ARCH.  I screwed up , mis-set
it to i386 just before beginning to  bring in a lot of KDE upgrade
ports.  Oops.

OK, I used "file" to locate i386 libraries, and I rebuilt (from sources,
the ports directly) very nearly everything.  FreeBSD is *SO* darned
stable, I have really only hit just thing single really killer problem ...

The problem??  Can't start X11.  When I try a startx, I get about a done
lines, but they're really just all copies of one of these two lines:

/libexec/ld-elf.so.1: /usr/X11R6/lib/libX11.so.6: unsupported file layout
/libexec/ld-elf.so.1: /usr/X11R6/lib/libXau.so.0: unsupported file layout

july:chuckr:/usr/X11R6/lib:#27>file libX11.so.6 libXau.so.0
libX11.so.6: ELF 64-bit LSB shared object, AMD x86-64, version 1
(FreeBSD), not stripped
libXau.so.0: ELF 64-bit LSB shared object, AMD x86-64, version 1
(FreeBSD), not stripped

These happen to be precisely what all the other X11 libraries are
reporting, too.  OK, these are all of the more obvious hints.  If you
can think up any other ones, I'd very much appreciate a note to me. 
Being as candid as I can be, I'm actually enjoying doing this, running
down these problems.