From 50d90c91ac66dd2416da72ef4503ce9ec64419b8 Mon Sep 17 00:00:00 2001
From: James Ward <jam3sward@googlemail.com>
Date: Tue, 19 Mar 2024 19:06:19 +0000
Subject: [PATCH] M_PI was not defined by <cmath>

---
 examples/glview/glview.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/examples/glview/glview.cc b/examples/glview/glview.cc
index 849dc17f..f1d32b74 100644
--- a/examples/glview/glview.cc
+++ b/examples/glview/glview.cc
@@ -788,8 +788,10 @@ static void QuatToAngleAxis(const std::vector<double> quaternion,
     return;
   }
 
+  constexpr double pi = 3.14159265358979323846;
+
   double denom = sqrt(1-qw*qw);
-  outAngleDegrees = angleRadians * 180.0 / M_PI;
+  outAngleDegrees = angleRadians * 180.0 / pi;
   axis[0] = qx / denom;
   axis[1] = qy / denom;
   axis[2] = qz / denom;