dlopen failure on sbcl/macosx

Has anybody had success running clsql on SBCL on the Mac?

Compiling and loading goes well until find-and-load-foreign-library
(in uffi/clsql-uffi-loader.lisp) tries to load the clsql_uffi library.
When I add the commented-out warning to the error clause in the
handler-case form inside the function definition, it spews warnings
including this one:

WARNING:
   Error opening shared object "/local/src/lisp/clsql/uffi/clsql_uffi.dylib":
  dlopen(3) failed.

And then the load fails, of course.
But the named file does exist, and is seen by PROBE-FILE.

What would be the next step in debugging this?
The whole uffi thing is pretty much a black box to me.
Do I need to look inside it?

- Harald