instructions for SIA module on Tru64 5.1?

[Dave Love <d.love@dl.ac.uk>]

What's the procedure for installing the SIA module?  On Tru64 5.1a I
just got this:

# siacfg -a KRB5 /usr/shlib/libsia_krb5.so
dlopen /usr/shlib/libsia_krb5.so: dlopen: Cannot map library /usr/shlib/libsia_krb5.so at /usr/sbin/siacfg line 479.

I've no idea if it's relevant, but I note that `file' says the module
is `alpha compressed COFF shared library', whereas system ones are
`COFF format alpha shared library'.  I can't find info on (changing)
the COFF format to check.