gentoo-overlay/app-misc/emelfm2/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="project">
<email>desktop-misc@gentoo.org</email>
<name>Gentoo Desktop Miscellaneous Project</name>
  </maintainer>
  <use>
	  <flag name="ansi">
		  Add support for ANSI escape sequences
	  </flag>
	  <flag name="gtk3">
		  Use <pkg>x11-libs/gtk-3</pkg> instead of <pkg>x11-libs/gtk-2</pkg>
	  </flag>
  </use>
</pkgmetadata>