Patch to fix following is at:

http://bugs.gentoo.org/attachment.cgi?id=105679&action=view

i686-pc-linux-gnu-gcc  -O2 -march=athlon-xp -pipe  -Wl,-O1,--as-needed -o
xfce4-diskperf-plugin -lxfce4panel -lxfcegui4 -lgtk-x11-2.0 -lxfce4util
-lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lm -lpangocairo-1.0 -lpango-1.0
-lcairo -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0  
xfce4_diskperf_plugin-main.o xfce4_diskperf_plugin-config_gui.o
xfce4_diskperf_plugin-devperf.o  
xfce4_diskperf_plugin-main.o: In function `main':
main.c:(.text+0x1f): undefined reference to `gtk_init'
main.c:(.text+0x38): undefined reference to `xfce_external_panel_plugin_new'
main.c:(.text+0x73): undefined reference to `g_signal_connect_data'

Output supressed.

Thanks, S