From d189ee0167c4adfd06b0816e1ffcaaa31c65201a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6ren=20Tempel?= <soeren+git@soeren-tempel.net>
Date: Mon, 15 Oct 2018 22:06:00 +0200
Subject: main/libxshmfence: fix build failure

The `-D_GNU_SOURCE` is needed for the memfd_create function prototype in
`sys/memfd.h`. Without this change the build fails with the following
error message:

	xshmfence_alloc.c:73:7: error: implicit declaration of function 'memfd_create'
	  fd = memfd_create("xshmfence", MFD_CLOEXEC|MFD_ALLOW_SEALING);
	       ^~~~~~~~~~~~
---
 main/libxshmfence/APKBUILD | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/main/libxshmfence/APKBUILD b/main/libxshmfence/APKBUILD
index 89f21cda0e..501645e209 100644
--- a/main/libxshmfence/APKBUILD
+++ b/main/libxshmfence/APKBUILD
@@ -2,7 +2,7 @@
 # Maintainer:
 pkgname=libxshmfence
 pkgver=1.2
-pkgrel=3
+pkgrel=4
 pkgdesc="X11 shared memory fences"
 url="https://www.x.org/"
 arch="all"
@@ -16,7 +16,7 @@ source="https://www.x.org/releases/individual/lib/libxshmfence-$pkgver.tar.bz2"
 
 build() {
 	cd "$builddir"
-	./configure \
+	CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE" ./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
 		--prefix=/usr \
-- 
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