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-rw-r--r--indra/llmath/llinterp.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/indra/llmath/llinterp.h b/indra/llmath/llinterp.h
index 8beeef480b..36ca2e9865 100644
--- a/indra/llmath/llinterp.h
+++ b/indra/llmath/llinterp.h
@@ -32,6 +32,13 @@
#ifndef LL_LLINTERP_H
#define LL_LLINTERP_H
+#if defined(LL_WINDOWS)
+// macro definitions for common math constants (e.g. M_PI) are declared under the _USE_MATH_DEFINES
+// on Windows system.
+// So, let's define _USE_MATH_DEFINES before including math.h
+ #define _USE_MATH_DEFINES
+#endif
+
#include "math.h"
// Class from which different types of interpolators can be derived