awn-extras trunk fails to compile: Multiple redefinition warnings

Have compiled avant-window-navigator trunk successfully, with --with-desktop=xfce4.

Compiling awn-extras trunk, I get these error messages:

In file included from aff-results.c:25:
../../config.h:5:1: warning: "DBUS_API_SUBJECT_TO_CHANGE" redefined
<command-line>: warning: this is the location of the previous definition
In file included from /usr/include/exo-0.3/exo/exo.h:28,
                 from /usr/include/thunar-vfs-1/thunar-vfs/thunar-vfs-enum-types.h:6,
                 from /usr/include/thunar-vfs-1/thunar-vfs/thunar-vfs.h:26,
                 from /usr/local/stow/avant//include/libawn/awn-vfs.h:37,
                 from aff-results.c:37:
/usr/include/glib-2.0/glib/gi18n-lib.h:30:1: warning: "_" redefined
In file included from aff-results.c:33:
/usr/include/glib-2.0/glib/gi18n.h:25:1: warning: this is the location of the previous definition
In file included from /usr/include/exo-0.3/exo/exo.h:28,
                 from /usr/include/thunar-vfs-1/thunar-vfs/thunar-vfs-enum-types.h:6,
                 from /usr/include/thunar-vfs-1/thunar-vfs/thunar-vfs.h:26,
                 from /usr/local/stow/avant//include/libawn/awn-vfs.h:37,
                 from aff-results.c:37:
/usr/include/glib-2.0/glib/gi18n-lib.h:31:1: warning: "Q_" redefined
In file included from aff-results.c:33:
/usr/include/glib-2.0/glib/gi18n.h:26:1: warning: this is the location of the previous definition
aff-results.c: In function 'aff_results_popup_menu':
aff-results.c:425: error: 'ThunarVfsApplication' undeclared (first use in this function)
aff-results.c:425: error: (Each undeclared identifier is reported only once
aff-results.c:425: error: for each function it appears in.)
aff-results.c:425: error: expected expression before ')' token

Which look bafflingly odd. I'm on Debian lenny, with Debian packages of everything except awn.