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-rw-r--r--common/scummsys.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/common/scummsys.h b/common/scummsys.h
index b0f514cdd1..a12370ccd6 100644
--- a/common/scummsys.h
+++ b/common/scummsys.h
@@ -94,6 +94,11 @@
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
+ // MSVC does not define M_PI, M_SQRT2 and other math defines by default.
+ // _USE_MATH_DEFINES must be defined in order to have these defined, thus
+ // we enable it here. For more information, check:
+ // http://msdn.microsoft.com/en-us/library/4hwaceh6(v=VS.100).aspx
+ #define _USE_MATH_DEFINES
#include <math.h>
#endif