commit aad03dee9d593c5f4fc5c7ff633a572cc7e5737c
Author: Benda Xu <heroxbd@gentoo.org>
Date:   Mon Nov 18 12:35:34 2019 +0800

    dev-qt/qtcore: enable renameat2 and getentropy conditionally
    
    Add USE=modern-kernel to switch on new syscalls.
    
    renameat2() and getentropy() are not available until linux-3.17.
    
    Closes: https://bugs.gentoo.org/669994
    Closes: https://bugs.gentoo.org/675858
    Package-Manager: Portage-2.3.79, Repoman-2.3.18
    Signed-off-by: Benda Xu <heroxbd@gentoo.org>

diff --git a/dev-qt/qtcore/metadata.xml b/dev-qt/qtcore/metadata.xml
index c612265c6f79..6ed7d9ca0891 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="modern-kernel">Enable new syscalls for Linux kernel >= 3.17</flag>
 	</use>
 	<upstream>
 		<bugs-to>https://bugreports.qt.io/</bugs-to>