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

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<herd>haskell</herd>
	<maintainer>
		<email>haskell@gentoo.org</email>
	</maintainer>
	<longdescription>
		This is the core library of the Gtk2Hs suite of libraries for Haskell
		based on Gtk+. Gtk+ is an extensive and mature multi-platform toolkit
		for creating graphical user interfaces.
	</longdescription>
        <use>
          <flag name='gio'>Depend on GIO package, thereby enabling certain features.</flag>
          <flag name='fmode-binary'>Set the default file translation mode for
          file I/O operations to _O_BINARY.  Some GTK libraries open image
          files without specifing binary mode.  If you have trouble loading
          gtk in ghci, then it may help to turn this option off.</flag>
        </use>
</pkgmetadata>