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-rw-r--r--src/math/j1f.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/math/j1f.c b/src/math/j1f.c
index 6abde349..58875af9 100644
--- a/src/math/j1f.c
+++ b/src/math/j1f.c
@@ -13,6 +13,7 @@
* ====================================================
*/
+#define _GNU_SOURCE
#include "libm.h"
static float ponef(float), qonef(float);