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-rw-r--r--proto-shell.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/proto-shell.c b/proto-shell.c
index 41031c3..65ade12 100644
--- a/proto-shell.c
+++ b/proto-shell.c
@@ -1,3 +1,5 @@
+#define _GNU_SOURCE
+
#include <string.h>
#include <stdlib.h>
#include <stdio.h>