blob: 1f398773086da8edf6eff638e68b6b45e2eda53e (
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diff --git "a/lib/csa/nan.h" "b/lib/csa/nan.h"
index 29fd3d2f..7f16e8c8 100644
--- "a/lib/csa/nan.h"
+++ "b/lib/csa/nan.h"
@@ -19,6 +19,16 @@
#if !defined ( _NAN_H )
#define _NAN_H
+// Try to use the implementation-provided NAN constant:
+
+#include <math.h>
+
+#if defined(NAN)
+
+#define NaN ((double)NAN)
+
+#else // ^^^ implementation provides NAN // implementation does not provide NAN vvv
+
#if ( defined ( __GNUC__ ) && !defined ( __ICC ) ) || defined ( __BORLANDC__ )
static const double NaN = 0.0 / 0.0;
@@ -63,4 +73,6 @@ static const long long lNaN = ( (unsigned long long) 1 << 63 ) - 1;
#endif
+#endif // defined(NAN)
+
#endif
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