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-rw-r--r--src/math/jnf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/math/jnf.c b/src/math/jnf.c
index 648db32b..b0b36e6b 100644
--- a/src/math/jnf.c
+++ b/src/math/jnf.c
@@ -13,6 +13,7 @@
  * ====================================================
  */
 
+#define _GNU_SOURCE
 #include "libm.h"
 
 static const float