blob: d573ef080ff918a621f6c1a7ca0568949a6420a7 (
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diff --git a/src/curvature.c b/src/curvature.c
index 70f6af2..a5c0187 100644
--- a/src/curvature.c
+++ b/src/curvature.c
@@ -17,6 +17,9 @@
* Boston, MA 02111-1307, USA.
*/
+#ifdef _WIN32
+#define _USE_MATH_DEFINES
+#endif
#include <math.h>
#include "gts.h"
diff --git a/src/triangle.c b/src/triangle.c
index 1d82869..47170c6 100644
--- a/src/triangle.c
+++ b/src/triangle.c
@@ -17,6 +17,9 @@
* Boston, MA 02111-1307, USA.
*/
+#ifdef _WIN32
+#define _USE_MATH_DEFINES
+#endif
#include <math.h>
#include "gts.h"
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