Load problem on Mac OS X

Greetings,

I have tried using clg on my system (Mac OS X, using emacs and sbcl  
from MacPorts; I have dabbled with cmucl as well and run into similar  
problems). Unfortunately, (require :gtk) always ends up with an error  
like the following:

------ Begin
The function SB-ALIEN::SHARED-OBJECT-FILE is undefined.
    [Condition of type UNDEFINED-FUNCTION]

Restarts:
  0: [RETRY] Retry performing #<ASDF:LOAD-OP NIL {12314441}> on  
#<ASDF::SHARED-OBJECT "gffi-alien" {124A0C71}>.
  1: [ACCEPT] Continue, treating #<ASDF:LOAD-OP NIL {12314441}> on  
#<ASDF::SHARED-OBJECT "gffi-alien" {124A0C71}> as having been  
successful$
  2: [RETRY] Retry SLIME REPL evaluation request.
  3: [ABORT] Return to SLIME's top level.
  4: [ABORT] Exit debugger, returning to top level.

Backtrace:
   0: (ASDF::LOAD-SHARED-OBJECT #P"/Users/ix/Projects/software/ 
clg-0.93/gffi/gffi-alien.dylib" NIL)
   1: ((LAMBDA (SB-PCL::.PV. SB-PCL::.NEXT-METHOD-CALL. SB-PCL::.ARG0.  
SB-PCL::.ARG1.)) ..)
   2: ((SB-PCL::FAST-METHOD ASDF:PERFORM :AROUND (ASDF:OPERATION  
ASDF:COMPONENT)) ..)
   3: ((LAMBDA ()))
   4: ((FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK))
   5: (SB-C::%WITH-COMPILATION-UNIT #<CLOSURE (LAMBDA #) {124FCC2D}>) 
[:EXTERNAL]
   6: (ASDF:OPERATE ASDF:LOAD-OP :GFFI)[:EXTERNAL]
   7: (SB-INT:SIMPLE-EVAL-IN-LEXENV (ASDF:OOS 'ASDF:LOAD-OP :GFFI)  
#<NULL-LEXENV>)
   8: (SB-FASL::LOAD-AS-SOURCE #<SB-SYS:FD-STREAM for "file /Users/ 
ix/.sbcl/systems/glib.asd" {122C3541}> NIL NIL)
   9: ((FLET SB-FASL::LOAD-STREAM) #<SB-SYS:FD-STREAM for "file /Users/ 
ix/.sbcl/systems/glib.asd" {122C3541}>)
  10: (LOAD #P"/Users/ix/.sbcl/systems/glib.asd")[:EXTERNAL]
------ End

I have tried to figure out what is going on here, experimented with  
different settings and obviously Googled, but no luck so far. Since  
I'm also quite new to this whole Lisp universe, perhaps you could  
point me towards something I could try to get clg to run...

Thanks in advance,
Nicolai

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