From 90c59ecba4c1c74d619eb42f9b4f2c4d2acf198d Mon Sep 17 00:00:00 2001
From: "C. McEnroe" <june@causal.agency>
Date: Tue, 11 Feb 2020 19:03:39 -0500
Subject: [PATCH] Make sure -D_GNU_SOURCE ends up in CFLAGS on Linux

---
 configure | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure b/configure
index d230f4c..94545c4 100755
--- a/configure
+++ b/configure
@@ -24,3 +24,11 @@ CFLAGS += $(pkg-config --cflags $libs)
 LDFLAGS += $(pkg-config --libs-only-L $libs)
 LDLIBS = $(pkg-config --libs-only-l $libs)
 EOF
+
+case "$(uname)" in
+	(Linux)
+		if ! grep -q -e '-D_GNU_SOURCE' config.mk; then
+			echo 'CFLAGS += -D_GNU_SOURCE' >> config.mk
+		fi
+		;;
+esac