sys-apps/ethtool: Add "netlink" USE flag

Thanks-to: Thomas Masper <thomas.masper@gmail.com>
Closes: https://bugs.gentoo.org/723292
Package-Manager: Portage-2.3.99, Repoman-2.3.22
Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>

sys-apps/ethtool/ethtool-5.6-r1.ebuild

@@ -10,5 +10,11 @@ SRC_URI="https://www.kernel.org/pub/software/network/ethtool/${P}.tar.xz"
 LICENSE="GPL-2"
 SLOT="0"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~sparc ~x86"
+IUSE="+netlink"
 
 DEPEND="app-arch/xz-utils"
+RDEPEND="netlink? ( net-libs/libmnl )"
+
+src_configure() {
+	econf $(use_enable netlink)
+}

sys-apps/ethtool/metadata.xml

@@ -5,6 +5,9 @@
 	<email>base-system@gentoo.org</email>
 	<name>Gentoo Base System</name>
 </maintainer>
+<use>
+	<flag name="netlink">Enable netlink interface via <pkg>net-libs/libmnl</pkg></flag>
+</use>
 <longdescription lang="en">
 	ethtool is a Linux utility for controlling network drivers and hardware,
 	particularly for wired Ethernet devices. It can be used to: