gentoo-overlay/dev-php/php-gtk/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>php</herd>
  <longdescription>
    This PHP5 extension wraps the Gtk+ 2 library thereby
    providing the ability to write GUI applications in PHP.
  </longdescription>
  <use>
    <flag name="glade">Enable libglade support</flag>
    <flag name="libsexy">Enable libsexy support</flag>
    <flag name="mozembed">Enable GtkMozembed support</flag>
    <flag name="scintilla">Enable Scintilla support</flag>
  </use>
</pkgmetadata>