gcc -I/usr/local/include -I/usr/X11R6/include -Wl,-rpath -Wl,/usr/local/lib -o xfwm4 xfwm4-client.o 
xfwm4-compositor.o xfwm4-display.o xfwm4-event_filter.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-ui_style.o xfwm4-transients.o xfwm4-workspaces.o xfwm4-wireframe.o  -L/usr/local/lib -L
/usr/X11R6/lib -lXext /usr/local/lib/libxfce4mcs-client.so /usr/local/lib/libxfcegui4.so /usr/lib/libgtk-x11-2.0.so 
/usr/local/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/libgobject-2.0.so 
/usr/lib/libgmodule-2.0.so /usr/lib/libglib-2.0.so /usr/lib/libcairo.so /usr/local//lib/libgobject-2.0.so 
/usr/local//lib/libgmodule-2.0.so -ldl /usr/X11R6/lib/libfontconfig.so /usr/lib/libfreetype.so /usr/lib/libexpat.so -lpng12 -lz -lm 
/usr/local//lib/libglib-2.0.so /usr/lib/libstartup-notification-1.so -lSM -lICE -lX11 -lXrandr -lXrender -Wl,--rpath -Wl,/usr/local//lib -Wl,--rpath -Wl,/usr/local//lib
xfwm4-startup_notification.o(.text+0x658): 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/xfce4-4.4RC1-installer/xfwm4/src'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/tmp/xfce4-4.4RC1-installer/xfwm4'
gmake: *** [all] Error 2
!! Failed to build xfwm4, see the errors above
!! for details on the problem.