build errors libxfcegui4-4.5.91

[Myles Green]

/bin/bash ../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.
-I.. -I.. -I.. -DDATADIR=\"/usr/share\" -DG_LOG_DOMAIN=\"libxfcegui4\"
-DPACKAGE_LOCALE_DIR=\"/usr/share/locale\" -DPREFIX=\"/usr\"
-DG_ENABLE_DEBUG    -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include
-I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
-I/usr/include/pixman-1 -I/usr/include/freetype2
-I/usr/include/libpng12     -I/usr/include/xfce4
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
-I/usr/include/startup-notification-1.0   -errwarn=%all -Werror -Wall
-fno-strict-aliasing -Werror -Wall -O0 -g3 -g -O2 -MT
libxfcegui4_la-dialogs.lo -MD -MP -MF .deps/libxfcegui4_la-dialogs.Tpo
-c -o libxfcegui4_la-dialogs.lo `test -f 'dialogs.c' || echo
'./'`dialogs.c gcc -DHAVE_CONFIG_H -I. -I.. -I.. -I..
-DDATADIR=\"/usr/share\" -DG_LOG_DOMAIN=\"libxfcegui4\"
-DPACKAGE_LOCALE_DIR=\"/usr/share/locale\" -DPREFIX=\"/usr\"
-DG_ENABLE_DEBUG -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include
-I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
-I/usr/include/pixman-1 -I/usr/include/freetype2
-I/usr/include/libpng12 -I/usr/include/xfce4 -I/usr/include/glib-2.0
-I/usr/lib/glib-2.0/include -I/usr/include/startup-notification-1.0
-errwarn=%all -Werror -Wall -fno-strict-aliasing -Werror -Wall -O0 -g3
-g -O2 -MT libxfcegui4_la-dialogs.lo -MD -MP
-MF .deps/libxfcegui4_la-dialogs.Tpo -c dialogs.c  -fPIC -DPIC
-o .libs/libxfcegui4_la-dialogs.o cc1: warnings being treated as errors
dialogs.c: In function ‘message_dialog’: dialogs.c:278: error: format
not a string literal and no format arguments dialogs.c: In function
‘xfce_confirm’: dialogs.c:447: error: format not a string literal and
no format arguments make[3]: *** [libxfcegui4_la-dialogs.lo] Error 1
make[3]: Leaving directory
`/home/trebor/Downloads/Xfce-4.6/Beta-1/libxfcegui4-4.5.91/libxfcegui4'
make[2]: *** [all] Error 2 make[2]: Leaving directory
`/home/trebor/Downloads/Xfce-4.6/Beta-1/libxfcegui4-4.5.91/libxfcegui4'
make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory
`/home/trebor/Downloads/Xfce-4.6/Beta-1/libxfcegui4-4.5.91' make: ***
[all] Error 2

There's probably something I'm not aware of that's causing this...
Ubuntu 8.10, up to date. Can anyone point me in there right direction
please?

TIA,
Myles

-- 
"GNU is not Unix.
Linux is not GNU/Linux."

A Quote-able by Allan Kennington [1]
[1] http://www.topology.org/linux/lingl.html