From 33fc119dd9006a097756e71a160e8472bbdd5da0 Mon Sep 17 00:00:00 2001
From: Jorge Miguel Silva <jorgeMFS@users.noreply.github.com>
Date: Wed, 11 Jan 2023 18:40:22 +0000
Subject: [PATCH] added M_PI definition

---
 src/filter.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/filter.c b/src/filter.c
index 57a4c2c..7cec928 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -7,6 +7,7 @@
 #include "filter.h"
 #include "mem.h"
 
+#define M_PI   3.14159265358979323846264338327950288
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 static double CalcMean(Entry *entries, int nEntries, int n, int M, double *w){