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-rw-r--r--src/stdlib/gcvt.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stdlib/gcvt.c b/src/stdlib/gcvt.c
index 6c075e25..f29bc304 100644
--- a/src/stdlib/gcvt.c
+++ b/src/stdlib/gcvt.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>