problem with last clg (cvs version) : pango

hello,
i've just download the last clg (from cvs), and try to load it :

$> sbcl
This is SBCL 0.9.14, 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.

* (asdf:oos 'asdf:load-op :gffi)
[...] <-- ok

* (asdf:oos 'asdf:load-op :pango)
[...]

; compiling (IN-PACKAGE "PANGO")
; compiling (INIT-TYPES-IN-LIBRARY "/usr/lib/libpango-1.0.so" ...)
; compiling (INIT-TYPES-IN-LIBRARY "/usr/lib/libpangoxft-1.0.so" ...)
; compiling (INIT-TYPES-IN-LIBRARY "/usr/lib/libpangoft2-1.0.so" ...)
; compiling (DEFINE-TYPES-BY-INTROSPECTION "Pango")
; compiling (DEFCLASS FONT-DESCRIPTION ...)
debugger invoked on a SB-KERNEL:CASE-FAILURE in thread #<THREAD "initial
thread" {A814439}>:
  (SETF FONT-DESCRIPTION-SIZE) fell through ETYPECASE expression.
  Wanted one of #'SYMBOL.

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

restarts (invokable by number or by possibly-abbreviated name):
  0: [RETRY ] Retry performing #<ASDF:COMPILE-OP NIL {AC30511}> on
              #<ASDF:CL-SOURCE-FILE "pango" {AC30AA9}>.
  1: [ACCEPT] Continue, treating #<ASDF:COMPILE-OP NIL {AC30511}> on
              #<ASDF:CL-SOURCE-FILE "pango" {AC30AA9}> as having been
              successful.
  2: [ABORT ] Exit debugger, returning to top level.

((SB-PCL::FAST-METHOD COMPUTE-SLOT-WRITER-FUNCTION
                      (EFFECTIVE-VIRTUAL-SLOT-DEFINITION))
 (#(NIL 16) . #())
 #<unavailable argument>
 #<GFFI::EFFECTIVE-VIRTUAL-ALIEN-SLOT-DEFINITION SIZE>)
0]


someone have this error ?



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