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M_PI may not be defined

When building with gcc 4.7.2 and -std=c99 , M_PI is not defined

--- a/dumb/src/helpers/lanczos_resampler.c

+++ b/dumb/src/helpers/lanczos_resampler.c

@@ -3,6 +3,10 @@

 #define _USE_MATH_DEFINES

 #include <math.h>

+#ifndef M_PI

+#define M_PI 3.14159265358979323846

+#endif

+

 #include "internal/lanczos_resampler.h"

 enum { LANCZOS_RESOLUTION = 8192 };