Enable single instance support using dev-libs/libunique

Packages describing “unique” as local USE flag

Package “unique” Flag Description
media-sound/gmpc Enable single instance support using dev-libs/libunique
sci-visualization/gwyddion Enable remote control backend via dev-libs/libunique
gnome-extra/gnome-commander Enable single instance support using dev-libs/libunique

All packages providing a “unique” USE flag (1)