FreeBSD 5.4R fails to run i386 binaries. Missing ld-elf32.so.1

[Adri Koppes]

I recently installed a new FreeBSD 5.4 release on a Dell 1850 using dual Intel Xeon EM64T processors.
During install I was asked whether to support 32-bit compatibility, which I enabled.
Running amd64 binaries and FreeBSD 4.x/5.x i386 statically linked binaries works fine.
When I attempt to execute FreeBSD 4.x/5.x i386 dynamically linked libraries, I get the following error:

ELF interpreter /libexec/ld-elf32.so.1 not found
Abort

It seems the i386 loader did not get installed by default and I can't find the i386 shared libraries either.
How can I install the ld-elf32.so.1 loader and the FreeBSD 4.x/5x i386 shared libraries? Preferable from the distribution CD's.
I have seen references to using build32.sh, related to FreeBSD 5.2 and 5.3, but this seems to require a full source tree, make buildworld, followed by build32.sh.
Is this still required for FreeBSD 5.4R on a production system?

Adri.