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-rw-r--r--src/math/__invtrigl.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/math/__invtrigl.h b/src/math/__invtrigl.h
index 2d97133b..bee79317 100644
--- a/src/math/__invtrigl.h
+++ b/src/math/__invtrigl.h
@@ -1,3 +1,5 @@
+#include <features.h>
+
/* shared by acosl, asinl and atan2l */
#define pio2_hi __pio2_hi
#define pio2_lo __pio2_lo