XFCE 4.4 Beta1 - failed to compile - undefined referente to sn_startup_sequence_get_timestamp

[Fahrenheit]

Hi all, i downloaded the gui installer of the new beta, and started
compiling xfce, besides the default installer options i only choose
optimize code, the thing is, almost at 100%, during the make all of the
WM, the compilation fails:

gcc -I/opt/xfce4/include -I/usr/X11R6/include -I/usr/X11R6/include -O2
-pipe -Wl,-rpath -Wl,/opt/xfce4/lib -Wl,-O1 -o xfwm4 xfwm4-client.o
xfwm4-compositor.o xfwm4-display.o xfwm4-events.o xfwm4-focus.o
xfwm4-frame.o xfwm4-hints.o xfwm4-icons.o xfwm4-keyboard.o xfwm4-main.o
xfwm4-menu.o xfwm4-misc.o xfwm4-mypixmap.o xfwm4-mywindow.o
xfwm4-netwm.o xfwm4-parserc.o xfwm4-placement.o xfwm4-poswin.o
xfwm4-screen.o xfwm4-session.o xfwm4-settings.o xfwm4-spinning_cursor.o
xfwm4-stacking.o xfwm4-startup_notification.o xfwm4-tabwin.o
xfwm4-transients.o xfwm4-workspaces.o xfwm4-wireframe.o
-L/opt/xfce4/lib
-L/usr/X11R6/lib /opt/xfce4/lib/libxfce4mcs-client.so /opt/xfce4/lib/libxfcegui4.so /usr/lib/libgtk-x11-2.0.so /opt/xfce4/lib/libxfce4util.so /usr/lib/libgdk-x11-2.0.so /usr/lib/libatk-1.0.so /usr/lib/libgdk_pixbuf-2.0.so /usr/lib/libpangocairo-1.0.so /usr/lib/libpangoft2-1.0.so /usr/lib/libpango-1.0.so /usr/lib/libcairo.so
-lpng12 /usr/X11R6/lib/libfontconfig.so /usr/lib/libexpat.so /usr/lib/libfreetype.so
-lz -lm /usr/lib/libgobject-2.0.so /usr/lib/libgmodule-2.0.so
-ldl /usr/lib/libglib-2.0.so
-lXpm /usr/lib/libstartup-notification-1.so -lSM -lICE -lXext
-lXcomposite -lXdamage -lXfixes -lX11 -lXrandr -lXrender
xfwm4-startup_notification.o(.text+0x464): In function
`sn_client_startup_properties': : undefined reference to
`sn_startup_sequence_get_timestamp' 
collect2: ld returned 1 exit status
gmake[2]: *** [xfwm4] Error 1 
gmake[2]: Leaving directory `/tmp/xfce4-4.3.90.1-installer/xfwm4/src'
gmake[1]: *** [all-recursive] Error 1 
gmake[1]: Leaving directory `/tmp/xfce4-4.3.90.1-installer/xfwm4' 
gmake: *** [all] Error 2 
!! Failed to build xfwm4, see the errors above 
!! for details on the problem.


the full log is attached.

any ideias?

anyway, thanks in advance for any help.
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