Error building xfce4-genmon-plugin in Ubuntu 11.04 - do I need newer version?

[Chris Green]

I am trying to build the xfce4-genmon-plugin in xubuntu 11.04 to
incorporate a fix I did a while ago (on xubuntu 10.10 I think).

I'm getting the following error:-

    xfce4_genmon_plugin-main.o: In function `genmon_create_options':
    /home/chris/src/xfce4-genmon-plugin/panel-plugin/main.c:663: undefined reference to `xfce_create_header'
    xfce4_genmon_plugin-main.o: In function `About':
    /home/chris/src/xfce4-genmon-plugin/panel-plugin/main.c:588: undefined reference to `xfce_info'
    collect2: ld returned 1 exit status
    make[2]: *** [xfce4-genmon-plugin] Error 1
    make[2]: Leaving directory `/home/chris/src/xfce4-genmon-plugin/panel-plugin'
    make[1]: *** [all-recursive] Error 1
    make[1]: Leaving directory `/home/chris/src/xfce4-genmon-plugin'
    make: *** [all] Error 2

Do I need a newer version of the xfce4-genmon-plugin source from
somewhere to fix this, or what?

-- 
Chris Green