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-rw-r--r--src/math/sincosf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/math/sincosf.c b/src/math/sincosf.c
index 1b50f01c..f8ca7232 100644
--- a/src/math/sincosf.c
+++ b/src/math/sincosf.c
@@ -14,6 +14,7 @@
* ====================================================
*/
+#define _GNU_SOURCE
#include "libm.h"
/* Small multiples of pi/2 rounded to double precision. */