How to load maxima as a asdf package? (sbcl)

Hi ,all
  I found maxima.asd file in maxima/src/. So I want to load maxima as
a asdf package using sbcl. But I have some issues.

$ cd maxima/src
$ sbcl
This is SBCL 1.0.45.4, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>;.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and COPYING files in the
distribution for more information.
* (require :asdf)

("ASDF")
* (asdf:load-system :maxima)
.
.
.

; compilation finished in 0:00:00.192
; compiling file
"/home/wsw/Sources/maxima/src/numerical/slatec/derfc.lisp" (written 08
APR 2009 08:04:22 AM):
; compiling (IN-PACKAGE :SLATEC)
; compiling (LET (# # ...) ...)
; file: /home/wsw/Sources/maxima/src/numerical/slatec/derfc.lisp
; in: DEFUN DERFC
;     (F2CL-LIB:FSQRT (* 2.0d0 (F2CL-LIB:D1MACH 3)))
; --> BLOCK TYPECASE LET COND IF PROGN SQRT COERCE THE
; ==>
;   (SB-KERNEL:%SINGLE-FLOAT SB-C::X)
;
; caught STYLE-WARNING:
;   Result is a (VALUES (SINGLE-FLOAT 0.0f0) &OPTIONAL), not a DOUBLE-FLOAT.
;   See also:
;     The SBCL Manual, Node "Handling of Types"

;     (SETF SLATEC::TXMAX (F2CL-LIB:FSQRT (- (F2CL-LIB:FLOG #))))
; --> SETQ
; ==>
;   (THE #<SB-KERNEL:NUMERIC-TYPE DOUBLE-FLOAT>
;        (F2CL-LIB:FSQRT (- (F2CL-LIB:FLOG (* SLATEC::SQRTPI #)))))
;
; caught WARNING:
;   Asserted type DOUBLE-FLOAT conflicts with derived type
;   (VALUES (OR (COMPLEX SINGLE-FLOAT) (COMPLEX DOUBLE-FLOAT)
(SINGLE-FLOAT 0.0f0))
;           &OPTIONAL).
;   See also:
;     The SBCL Manual, Node "Handling of Types"

; compiling (IN-PACKAGE #:CL-USER)

; /home/wsw/Sources/maxima/src/binary-ecl/numerical/slatec/ASDF-TMP-derfc.fasl
written
; compilation finished in 0:00:00.130
WARNING:
   COMPILE-FILE warned while performing #<COMPILE-OP NIL {10036B8E81}> on
   #<CL-SOURCE-FILE "maxima" "numerical" "slatec" "derfc">.

debugger invoked on a ASDF:COMPILE-FAILED in thread #<THREAD
                                                      "initial thread" RUNNING
                                                      {1002BBB0D1}>:
  erred while invoking #<COMPILE-OP NIL {10036B8E81}> on
  #<CL-SOURCE-FILE "maxima" "numerical" "slatec" "derfc">

Type HELP for debugger help, or (SB-EXT:QUIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [TRY-RECOMPILING] Try recompiling derfc
  1: [RETRY          ] Retry
                       compiling component ("maxima" "numerical"
"slatec" "derfc").
  2: [ACCEPT         ] Continue, treating
                       compiling component ("maxima" "numerical"
"slatec" "derfc")
                       as having been successful.
  3: [ABORT          ] Exit debugger, returning to top level.

((SB-PCL::FAST-METHOD ASDF:PERFORM (ASDF:COMPILE-OP ASDF:CL-SOURCE-FILE))
 #<unavailable argument>
 #<unavailable argument>
 #<ASDF:COMPILE-OP NIL {10036B8E81}>
 #<ASDF:CL-SOURCE-FILE "maxima" "numerical" "slatec" "derfc">)
0]
============================================================

There is a error come up.
But clisp and ecl do the job just OK.

Any idea?
Thanks a lot!