--- /dev/null
+From f4e2142089487b7f5c99da949d7bf8d038724df7 Mon Sep 17 00:00:00 2001
+From: William Hubbs <w.d.hubbs@gmail.com>
+Date: Tue, 1 May 2018 13:28:57 -0500
+Subject: [PATCH] Add _POSIX_C_SOURCE definition to Linux build
+
+We need this to allow builds on uclibc-ng based systems.
+
+X-Gentoo-Bug: 650908
+X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=650908
+---
+ mk/os-Linux.mk | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/mk/os-Linux.mk b/mk/os-Linux.mk
+index 2479ff5b..9e8a1485 100644
+--- a/mk/os-Linux.mk
++++ b/mk/os-Linux.mk
+@@ -11,7 +11,7 @@
+ SFX= .Linux.in
+ PKG_PREFIX?= /usr
+
+-CPPFLAGS+= -D_DEFAULT_SOURCE
++CPPFLAGS+= -D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200809L
+ LIBDL= -Wl,-Bdynamic -ldl
+
+ ifeq (${MKSELINUX},yes)
+--
+2.16.1
+