--- numpy/core/src/npymath/ieee754.c.src	2020-09-20 14:53:51.998825328 +1000
+++ numpy/core/src/npymath/ieee754.c.src	2020-09-20 14:54:03.611889518 +1000
@@ -8,6 +8,8 @@
 #include "npy_math_private.h"
 #include "numpy/utils.h"
 
+#include "fenv-constants.h"
+
 #ifndef HAVE_COPYSIGN
 double npy_copysign(double x, double y)
 {