With xfce4-panel 4.9.0 under FreeBSD, clock plugin fails.

I applied patch found here, https://bugzilla.xfce.org/show_bug.cgi?id=8297

Everything compile, but clock plugin doesn't start. Below, output taken from .xsession-error

(xfsettingsd:1458): xfsettingsd-WARNING **: Failed to get the _NET_NUMBER_OF_DESKTOPS property.
xfce4-panel-Message: Plugin "(null)-5" was not found and has been removed from the configuration

(xfce4-panel:1447): xfce4-panel-CRITICAL **: Failed to load module "/usr/local/lib/xfce4/panel/plugins/libclock.so": /usr/local/lib/xfce4/panel/plugins/libclock.so: Undefined symbol "timer_create".

(process:1486): xfce4-panel-wrapper-CRITICAL **: Wrapper clock-5: Failed to open plugin module "/usr/local/lib/xfce4/panel/plugins/libclock.so": /usr/local/lib/xfce4/panel/plugins/libclock.so: Undefined symbol "timer_create".
xfce4-panel-Message: Plugin clock-5 has been automatically restarted after crash.

(process:1487): xfce4-panel-wrapper-CRITICAL **: Wrapper clock-5: Failed to open plugin module "/usr/local/lib/xfce4/panel/plugins/libclock.so": /usr/local/lib/xfce4/panel/plugins/libclock.so: Undefined symbol "timer_create".

Note: Orage plugin works fine.