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-rw-r--r--src/templating/mustach-tool.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/templating/mustach-tool.c b/src/templating/mustach-tool.c
index 83a0813e5..e2a5c1f40 100644
--- a/src/templating/mustach-tool.c
+++ b/src/templating/mustach-tool.c
@@ -6,7 +6,9 @@
SPDX-License-Identifier: ISC
*/
+#ifndef _GNU_SOURCE
#define _GNU_SOURCE
+#endif
#include <stdlib.h>
#include <stdio.h>