When compiling the latest SVN of the mixer plugin I get this error:

mv -f .deps/libxfce4mixer_la-vcs.Tpo .deps/libxfce4mixer_la-vcs.Plo
 x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I.. -I../include -I/usr/include/gtk-2.0 -I/usr/lib64/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/xfce4 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -O2 -march=k8 -fomit-frame-pointer -pipe -funroll-loops -I/usr/include/alsa -MT libxfce4mixer_la-vc.lo -MD -MP -MF .deps/libxfce4mixer_la-vc.Tpo -c vc.c  -fPIC -DPIC -o .libs/libxfce4mixer_la-vc.o
libtool: link: cannot find the library `libxfce4mixer.la' or unhandled argument `libxfce4mixer.la'
make[2]: *** [test_vc] Error 1
make[2]: *** Waiting for unfinished jobs....
mv -f .deps/libxfce4mixer_la-trans.Tpo .deps/libxfce4mixer_la-trans.Plo
vc_alsa_fallback.c: In function `vc_get_control_list':
vc_alsa_fallback.c:94: warning: ignoring return value of `g_list_append', declared with attribute warn_unused_result
mv -f .deps/libxfce4mixer_la-vc_alsa_fallback.Tpo .deps/libxfce4mixer_la-vc_alsa_fallback.Plo
mv -f .deps/libxfce4mixer_la-vc.Tpo .deps/libxfce4mixer_la-vc.Plo
mv -f .deps/libxfce4mixer_la-vc_alsa.Tpo .deps/libxfce4mixer_la-vc_alsa.Plo
make[2]: Leaving directory `/var/tmp/portage/xfce4-mixer-9999/work/xfce4-mixer-9999/lib'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/var/tmp/portage/xfce4-mixer-9999/work/xfce4-mixer-9999'
make: *** [all] Error 2

I'm using Gentoo btw