gentoo-overlay/media-plugins/imlib2_loaders/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="person">
    <email>juippis@gentoo.org</email>
    <name>Joonas Niilola</name>
  </maintainer>
  <use>
    <flag name="eet">Enable Eet image loader</flag>
    <flag name="xcf">Enable XCF image loader</flag>
  </use>
  <longdescription>
    This package contains image loader plugins for Imlib2 that are not 
    distributed together with the Imlib2 package itself.

    The XCF loader cannot be packaged together with Imlib2 because 
    Imlib2 is distributed under the BSD license, whereas the XCF loader 
    is using elements of the Gimp's (www.gimp.org) codebase, which is 
    distributed under the GPL. The XCF loader therefore is GPL'd as well.
  </longdescription>
</pkgmetadata>