gentoo-overlay/dev-libs/glib/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>gnome</herd>
  <use>
	<flag name="systemtap">Build support for profiling and tracing using 
		<pkg>dev-util/systemtap</pkg></flag>
	<flag name="utils">Install gtester-report utility to generate test
		report files for your software.</flag>
  </use>
</pkgmetadata>