From 4430fa0e3ea797cc18a01a311bd1c6ae03ce9ca5 Mon Sep 17 00:00:00 2001
From: Nirbheek Chauhan <nirbheek@centricular.com>
Date: Mon, 11 Mar 2019 15:00:59 +0530
Subject: [PATCH] closedcaption: Fix build with Visual Studio

../ext/closedcaption/io-sim.c(440): error C2065: 'M_PI': undeclared identifier
../ext/closedcaption/io-sim.c(442): error C2065: 'M_LN2': undeclared identifier
---
 ext/closedcaption/io-sim.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ext/closedcaption/io-sim.c b/ext/closedcaption/io-sim.c
index 8ba58ab225..6d54576b96 100644
--- a/ext/closedcaption/io-sim.c
+++ b/ext/closedcaption/io-sim.c
@@ -25,6 +25,9 @@
 #  include "config.h"
 #endif
 
+#ifdef _MSC_VER
+#define _USE_MATH_DEFINES       /* Needed for M_PI and M_LN2 */
+#endif
 #include <math.h>               /* sin(), log() */
 #include <errno.h>
 #include <ctype.h>              /* isspace() */