gentoo-overlay/mail-client/thunderbird/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>mozilla</herd>
<use>
	<flag name="bindist">Disable official Firefox branding (icons, name) which 
		are not binary-redistributable according to upstream.</flag>
	<flag name='crypt'> Enable encryption support with enigmail</flag>
	<flag name='mozdom'>Enable Mozilla's DOM inspector</flag>
	<flag name='lightning'>Enable calendar support</flag>
	<flag name='custom-optimization'>Enable user CFLAGS</flag>
	 <flag name='system-sqlite'>Use the system-wide <pkg>dev-db/sqlite</pkg>
		 installation with secure-delete enabled</flag>
	<flag name="ipc">Use inter-process communication between tabs and plugins.
		Allows for greater stability in case of plugin crashes</flag>
	<flag name="crashreporter">Enable crash reporter for bugs</flag>
	<flag name="gconf">Enable gnome2 gconf support</flag>
	<flag name="webm">Use system <pkg>media-libs/libvpx</pkg> for HTML5 WebM
		video support.</flag>
	<flag name="minimal">Remove the software development kit and headers</flag>
</use>
</pkgmetadata>