gentoo-overlay/sys-devel/sparse/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>kernel-misc</herd>
  <herd>toolchain</herd>
  <use>
    <flag name='gtk'>
      Build the test-inspect utility (requires
      <pkg>x11-libs/gtk+</pkg> version 2)
    </flag>
	<flag name='llvm'>Build the sparse-llvm utility</flag>
    <flag name='xml'>
      Build the c2xml utility (requires <pkg>dev-libs/libxml2</pkg>).
    </flag>
  </use>
</pkgmetadata>