gentoo-overlay/x11-libs/qt-demo/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<herd>qt</herd> 
	<use>
		<flag name='exceptions'>Add support for exceptions - like catching them
			inside the event loop (recommended by Nokia)</flag>
		<flag name='qt3support'>Enable the Qt3Support libraries for Qt4. Note that
			this does not mean you can compile pure Qt3 programs with Qt4.</flag>
	</use>
</pkgmetadata>