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-rw-r--r--src/math/scalbf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/math/scalbf.c b/src/math/scalbf.c
index 94364974..f44ed5b6 100644
--- a/src/math/scalbf.c
+++ b/src/math/scalbf.c
@@ -13,6 +13,7 @@
* ====================================================
*/
+#define _GNU_SOURCE
#include <math.h>
float scalbf(float x, float fn)