gentoo-overlay/dev-util/perf/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="person">
    <email>naota@gentoo.org</email>
  </maintainer>
  <use>
    <flag name="demangle">
      Enable C++ symbol name demangling, using libbfd from
      <pkg>sys-devel/binutils</pkg>. When this flag is enabled, the
      package will have to be rebuilt after every version bump of
      binutils.
    </flag>
    <flag name="doc">
      Build documentation and man pages. With this USE flag disabled,
      the --help parameter for perf and its sub-tools will not be
      available. This is optional because it depends on a few
      documentation handling tools that are not always welcome on user
      systems.
    </flag>
	<flag name="numa">Enable NUMA support</flag>
    <flag name="perl">
      Add support for Perl as a scripting language for perf tools.
    </flag>
    <flag name="unwind">
      Use sys-libs/libunwind for frame unwinding support.
    </flag>
  </use>
</pkgmetadata>