gentoo-overlay/app-admin/gkrellm/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<!-- maintainer-needed -->
	<use>
		<flag name="gnutls">Enable SSL support for mail checking with <pkg>net-libs/gnutls</pkg> (overrides 'ssl' USE flag)</flag>
		<flag name="ssl">Enable SSL support for mail checking with <pkg>dev-libs/openssl</pkg></flag>
		<flag name="lm-sensors">Enable monitoring sensors via <pkg>sys-apps/lm-sensors</pkg></flag>
		<flag name="X">Build both the X11 gui (gkrellm) and the server (gkrellmd). Disabling this flag builds the server only</flag>
		<flag name="ntlm">Enable NTLM authentication for mail checking with <pkg>net-libs/libntlm</pkg></flag>
	</use>
</pkgmetadata>