musl - musl - an implementation of the standard library for Linux-based systems

diff --git a/src/math/scalb.c b/src/math/scalb.c
index a54bdf2b..efe69e60 100644
--- a/src/math/scalb.c
+++ b/src/math/scalb.c

@@ -15,6 +15,7 @@

* should use scalbn() instead.

*/

+#define _GNU_SOURCE

#include <math.h>

double scalb(double x, double fn)