+++ This bug was initially created as a clone of Bug #8514 +++ The plugin - like most other plugins - implicitly links against libm. This can cause overlinking and become a security problem, thus distributions like Fedora and Ubuntu have changed the default behavior of ld to no longer emit DT_NEEDED. on these distributions the build will then fail with: /bin/sh ../libtool --tag=CC --mode=link gcc -std=gnu99 -pthread -I/usr/include/xfce4/libxfce4panel-1.0 -I/usr/include/gtk-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/xfce4 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng15 -pthread -I/usr/include/xfce4 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/pango-1.0 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng15 -I/usr/include/atk-1.0 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables -Wl,-z,relro -o xfce4-diskperf-plugin xfce4_diskperf_plugin-main.o xfce4_diskperf_plugin-config_gui.o xfce4_diskperf_plugin-devperf.o -Wl,--export-dynamic -pthread -lxfce4panel-1.0 -lgtk-x11-2.0 -lgmodule-2.0 -lrt -lxfce4util -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lglib-2.0 -lxfcegui4 -lgtk-x11-2.0 -lxfce4util -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lglib-2.0 libtool: link: gcc -std=gnu99 -pthread -I/usr/include/xfce4/libxfce4panel-1.0 -I/usr/include/gtk-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/xfce4 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng15 -pthread -I/usr/include/xfce4 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/pango-1.0 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng15 -I/usr/include/atk-1.0 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables -Wl,-z -Wl,relro -o xfce4-diskperf-plugin xfce4_diskperf_plugin-main.o xfce4_diskperf_plugin-config_gui.o xfce4_diskperf_plugin-devperf.o -Wl,--export-dynamic -pthread -lxfce4panel-1.0 -lgmodule-2.0 -lrt -lxfcegui4 -lgtk-x11-2.0 -lxfce4util -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lglib-2.0 -pthread /usr/bin/ld: xfce4_diskperf_plugin-main.o: undefined reference to symbol 'roundf@@GLIBC_2.1' /usr/bin/ld: note: 'roundf@@GLIBC_2.1' is defined in DSO /lib/libm.so.6 so try adding it to the linker command line /lib/libm.so.6: could not read symbols: Invalid operation For more info see http://fedoraproject.org/wiki/Features/ChangeInImplicitDSOLinking and For reference http://fedoraproject.org/wiki/UnderstandingDSOLinkChange
Fixed in http://git.xfce.org/panel-plugins/xfce4-wavelan-plugin/commit/?id=ff954a1937ca63ccb967de7c947308214ba29fa8
Closing.