xfce 4.4.2 installer package fail at XFCE4 Window Manager

[Tony.Shum]

Hi,

I downloaded the latest version with "-j 1" in the control.sh.  But I am 
getting following error message, any idea?

xfwm4-startup_notification.o: In function `sn_client_startup_properties':
/home/tshum/unix/archive/xfce/xfce4-4.4.2-installer/xfwm4/src/startup_notification.c:286: 
undefined reference to `sn_startup_sequence_get_timestamp'
collect2: ld returned 1 exit status


Thanks in advance.
--Tony