/usr/ is in libvalapanel-dev 0.3.65-0ubuntu1.
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..
/usr/include/vala-panel/
/usr/share/doc/
/usr/share/doc/libvalapanel-dev/
/usr/include/
/usr/include/vala-panel/applet-widget-api.h
/usr/include/vala-panel/applet-widget.h
/usr/include/vala-panel/config.h
/usr/include/vala-panel/constants.h
/usr/include/vala-panel/css.h
/usr/include/vala-panel/generic-config-dialog.h
/usr/include/vala-panel/launcher.h
/usr/include/vala-panel/menu-maker.h
/usr/include/vala-panel/misc.h
/usr/include/vala-panel/panel-platform.h
/usr/include/vala-panel/settings-manager.h
/usr/include/vala-panel/vala-panel-compat.h
/usr/include/vala-panel/vala-panel-enums.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/vala-panel.pc
/usr/share/
/usr/share/doc/libvalapanel-dev/copyright
/usr/share/vala/
/usr/share/vala/vapi/
/usr/share/vala/vapi/vala-panel.deps
/usr/share/vala/vapi/vala-panel.vapi
/usr/lib/x86_64-linux-gnu/libvalapanel.so
/usr/share/doc/libvalapanel-dev/changelog.Debian.gz