FTBFS: libsystemload.ver:2: syntax error in VERSION script
`make[2]: Entering directory '/root/tmp/xfce4-systemload-plugin-1.2.3/panel-plugin'`
`/bin/sh ../libtool --tag=CC --mode=link gcc -pthread -I/usr/include/xfce4/libxfce4ui-2 -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/libxml2 -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/xfce4 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -pthread -I/usr/include/xfce4/libxfce4panel-2.0 -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/libxml2 -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/xfce4 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -pthread -I/usr/include/libupower-glib -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -O2 -fPIC -avoid-version -module -no-undefined -export-symbols-regex '^xfce_panel_module_(preinit|init|construct)' -o libsystemload.la -rpath /usr/lib64/xfce4/panel/plugins libsystemload_la-systemload.lo libsystemload_la-uptime.lo libsystemload_la-memswap.lo libsystemload_la-cpu.lo -lxfce4ui-2 -lgtk-3 -lgdk-3 -lz -lpangocairo-1.0 -lpango-1.0 -lharfbuzz -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lxfce4util -lglib-2.0 -lxfce4panel-2.0 -lgtk-3 -lgdk-3 -lz -lpangocairo-1.0 -lpango-1.0 -lharfbuzz -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -Wl,--export-dynamic -lgmodule-2.0 -pthread -lxfce4util -lglib-2.0 -lupower-glib -lgobject-2.0 -lglib-2.0`
`libtool: link: rm -fr .libs/libsystemload.exp .libs/libsystemload.ver`
`libtool: link: /usr/bin/nm -B .libs/libsystemload_la-systemload.o .libs/libsystemload_la-uptime.o .libs/libsystemload_la-memswap.o .libs/libsystemload_la-cpu.o | sed -n -e 's/^.*[ ]\([ABCDGIRSTW][ABCDGIRSTW]*\)[ ][ ]*\([_A-Za-z][_A-Za-z0-9]*\)$/\1 \2 \2/p' | sed '/ __gnu_lto/d' | /usr/bin/sed 's/.* //' | sort | uniq > .libs/libsystemload.exp`
`libtool: link: /usr/bin/grep -E -e "^xfce_panel_module_(preinit|init|construct)" ".libs/libsystemload.exp" > ".libs/libsystemload.expT"`
`libtool: link: mv -f ".libs/libsystemload.expT" ".libs/libsystemload.exp"`
`libtool: link: echo "{ global:" > .libs/libsystemload.ver`
`libtool: link: cat .libs/libsystemload.exp | sed -e "s/\(.*\)/\1;/" >> .libs/libsystemload.ver`
`libtool: link: echo "local: *; };" >> .libs/libsystemload.ver`
`libtool: link: gcc -shared -fPIC -DPIC .libs/libsystemload_la-systemload.o .libs/libsystemload_la-uptime.o .libs/libsystemload_la-memswap.o .libs/libsystemload_la-cpu.o -lxfce4ui-2 -lxfce4panel-2.0 -lgtk-3 -lgdk-3 -lz -lpangocairo-1.0 -lpango-1.0 -lharfbuzz -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgmodule-2.0 -lxfce4util -lupower-glib -lgobject-2.0 -lglib-2.0 -pthread -pthread -pthread -O2 -Wl,--export-dynamic -pthread -pthread -pthread -pthread -pthread -pthread -Wl,-soname -Wl,libsystemload.so -Wl,-version-script -Wl,.libs/libsystemload.ver -o .libs/libsystemload.so`
`/usr/bin/ld:.libs/libsystemload.ver:2: syntax error in VERSION script`
`collect2: error: ld returned 1 exit status`
`make[2]: *** [Makefile:486: libsystemload.la] Error 1`
`make[2]: Leaving directory '/root/tmp/xfce4-systemload-plugin-1.2.3/panel-plugin'`
`make[1]: *** [Makefile:446: all-recursive] Error 1`
`make[1]: Leaving directory '/root/tmp/xfce4-systemload-plugin-1.2.3'`
`make: *** [Makefile:377: all] Error 2`
Also reported here: https://bugs.gentoo.org/744052