Install

Gnome Subtitles is in Portage. Emerge it as usual with:


emerge gnome-subtitles


You may need to unmask it before, to use the latest version, with:


echo "media-video/gnome-subtitles" >> /etc/portage/package.keywords


Run

Use the icon in the Gnome Menu or run it from a terminal with:

gnome-subtitles


Note about new releases

If the latest version isn't in Portage yet, you can usually find it in Gentoo Bugzilla.