xfce4-mixer compilation error

[Foxy]

Here it is:

xfce4/modules
xfce4_mixer_plug-in-plugin.o: In function `mixer_save':
/home/alex/xfce4-mixer/panel-plugin/plugin.c:109: undefined reference to 
`xfce_panel_plugin_get_rc_file'
xfce4_mixer_plugin-plugin.o: In function `mixer_construct':
/home/foxy/xfce4-mixer/panel-plugin/plugin.c:209: undefined reference to 
`xfce_panel_plugin_get_rc_file'
xfce4_mixer_plugin-xfce-mixer-preferences.o: In function 
`xfce_mixer_preferences_init':
/home/foxy/xfce4-mixer/panel-plugin/mixer-preferences.gob:201: undefined 
reference to `xmlconfig'
collect2: ld returned 1 exit status
make[2]: *** [xfce4-mixer-plugin] Error 1
make[2]: Leaving directory `/home/foxy/xfce4-mixer/panel-plugin'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/foxy/xfce4-mixer'
make: *** [all] Error 2

As I understand the problem is with panel plugin which has not been 
ported yet. How to build it without that plugin?