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Curioser and curioser.  The difference seems to be that
configure for 2.2.3 passes "-belf" to cc when checking for
dlopen but configure for 2.3 doesn't.

I actually have an idea how this happens: in 2.3, the CFLAGS
variable was split up into BASECFLAGS and OPT.  We know we
need -belf on SCO, so we stuff that into BASECFLAGS. 
However, this *doesn't* make the rest of the configure tests
use -belf -- result breakage.

(Martin, are you reading this?  Does this sound reasonable?)

Roger, can you try the attached patch?  It's a bit of a hack...