Steel Bank Common Lisp

I'm having some  problems loading foreign code into SBCL 0.8.5
on Darwin (OS X 10.3)

Essentially I'm trying to load the library libcpgplot.a,
which I've broken down into an object file cpgplot.o 
using:
  ar -x libcpgplot.a
  ld -r *.o -o cpgplot.o

I do it this way because simply loading a .a file did not work
under Linux, but this variant did work.   I also tried other
variants (see below)

I load the library with:

(sb-alien:load-alien '("cpgplot.o")
  :libraries  '("/data/Software/lib/libpgplot.a" 
                "/data/Software/lib/libcpgplot.a" 
                "-lc" "-lz"
                "/sw/lib/libpng.a"  "/usr/X11R6/lib/libX11.a"
                 ;; prevent undefined dyld_stub_binding_helper
                 "/usr/lib/bundle1.o"
                 ;; prevent undefined _G77_getenv_0
                 "/sw/lib/libg2c.a"
                  ;; other stuff that g77 seems  to want
                  "/usr/lib/libcc_kext.a" "/sw/lib/libf2c.a"))

the above mess came from a long round of experimention to
ensure all the symbols resolved during the load-alien call.

Now all the symbols are resolved, but when I try
to do sb-alien:define-alien-routine I get the error (eg)
   'unknown foreign symbol: "_cpgarro"'


The error occurs in (SB-SYS:FOREIGN-SYMBOL-ADDRESS-AS-INTEGER  "_cpgarro")
and cpgarro is the very first C function I use in def-alien-routine.
-- cpgarro is defined in libcpgplot.a

I could get this library to work under Linux and Solaris, but with a
different set of supporting libraries.

You will observe that I am loading libcpgplot.a twice (in
desperation): once as the cpgplot.o and once as libcpgplot.a, but I
can remove libcpgplot.a and it behaves the same, or I can replace
cpgplot.o with libcpgplot.a without changing the outcome.

Natually, as a test I tried to load a simple .o file with one
test function and no libraries, and that linked in just fine,
and I was able to call the test function.

Does anyone know if there are some tricks or peculiarities
with Darwin object file loading?  Am I just doing something obviously
dumb?

Many thanks for any help.



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