Trouble building latest sources using CMUCL 20C on Mac OS X Lion (x86_64)

Greetings!

I downloaded the CMUCL 20C binary for Darwin with Unicode support, then obtained the latest sources via git.  When I attempted to compile the sources, I get the following error during the stage-1 build of the compiler:

;; Loading #P"/Users/ipmonger/src/Lisp/cmucl/src/darwin-2/code/env-access.sse2f".
[Doing purification: Done.]
;; Loading #P"/Users/ipmonger/src/Lisp/cmucl/src/src/compiler/loadcom.lisp".
;;; Loading #P"/Users/ipmonger/src/Lisp/cmucl/src/darwin-2/compiler/backend.sse2f".

Undefined foreign symbol: "alloc_16_to_eax"
   [Condition of type SIMPLE-PROGRAM-ERROR]

Restarts:
  0: [CONTINUE] Return NIL from load of "c:backend".
  1:            Return NIL from load of "c:loadcom.lisp".
  2:            Return NIL from load of "target:tools/worldload".
  3: [ABORT   ] Return to Top-Level.

Debug  (type H for help)

(UNDEFINED-FOREIGN-SYMBOL-ERROR-HANDLER "<error finding name>"
                                        #.(INT-SAP #x47FDE1B8)
                                        #<Alien (*
                                                 SYSTEM-AREA-POINTER) at #x47FDE198>
                                        (16))
Source: 
; File: target:code/interr.lisp
(ERROR 'SIMPLE-PROGRAM-ERROR :FUNCTION-NAME NAME :FORMAT-CONTROL ...)
0]

  I'm using the following build line:

bin/build.sh -o lisp -C x86_darwin

--jon

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