--- qtcore-5.13.2.ebuild	2019-12-16 22:42:38.041257439 +0800
+++ qtcore-5.13.2-r1.ebuild	2019-12-17 09:04:04.536701981 +0800
@@ -11,7 +11,7 @@
 	KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~ppc ~ppc64 ~sparc ~x86"
 fi
 
-IUSE="icu systemd"
+IUSE="icu systemd kernel-3_17"
 
 DEPEND="
 	dev-libs/double-conversion:=
@@ -58,7 +55,9 @@
 
 src_configure() {
 	local myconf=(
 		-no-feature-statx	# bug 672856
+		$(qt_use kernel-3_17 feature-renameat2)
+		$(qt_use kernel-3_17 feature-getentropy)
 		$(qt_use icu)
 		$(qt_use !icu iconv)
 		$(qt_use systemd journald)
diff --git a/dev-qt/qtcore/metadata.xml b/dev-qt/qtcore/metadata.xml
index c612265c6f79..136ab183d962 100644
--- a/dev-qt/qtcore/metadata.xml
+++ b/dev-qt/qtcore/metadata.xml
@@ -7,6 +7,7 @@
 	</maintainer>
 	<use>
 		<flag name="systemd">Enable native journald logging support</flag>
+		<flag name="kernel-3_17">Enable new syscalls on Linux kernel >= 3.17</flag>
 	</use>
 	<upstream>
 		<bugs-to>https://bugreports.qt.io/</bugs-to>