g-wrap-1.9.9 and guile-gnome-platform 2.15.93 fails

After building the recent g-wrap-1.9.9, I tried building
guile-gnome-platform-2.15.93 with it, and ran into a problem:



make[4]: Entering directory `/usr/src/redhat/BUILD/guile-gnome-platform-2.15.93/
glib/gnome/gw'
guile  -c \
           "(debug-set! stack 400000) \
            (use-modules (gnome-0)) \
            (use-modules (g-wrap)) \
            (use-modules (gnome gw gobject-spec)) \
            (generate-wrapset 'guile 'gnome-gobject \"guile-gnome-gw-gobject\")"
WARNING: (g-wrap util): imported module (srfi srfi-34) overrides core binding `raise'
WARNING: (g-wrap): imported module (srfi srfi-34) overrides core binding `raise'
WARNING: (g-wrap rti): imported module (srfi srfi-34) overrides core binding `raise'
WARNING: (g-wrap c-types): imported module (srfi srfi-34) overrides core binding `raise'
WARNING: (gnome gw support g-wrap): `declarations-cg' imported from both (g-wrap c-codegen) and (g-wrap scm-codegen)
ERROR: No class slot with name `allowed-options' in class #<<gw-type-class> <gobject-object-type> 402489b0>
make[4]: *** [guile-gnome-gw-gobject.c] Error 1



The ERROR seems to be from this bit of code in support/gobject.scm:

(for-each (lambda (null-ok-class)
             (class-slot-set! null-ok-class 'allowed-options '(null-ok)))
           (list <gobject-object-type> <gobject-boxed-type>
                 <gobject-interface-type>))


It gets past this if I reinstall g-wrap-1.9.9-RC1, but then chokes on
some ffi.h issues (same ones I reported in RC1, and do seem fixed in the
g-wrap release.)

Anyone else seeing this "ERROR: No class slot with name `allowed-options'"
and have any suggestions?