From 1fd07fcd847659d518efa0897a9f603de83fe362 Mon Sep 17 00:00:00 2001
From: Jiri Slaby <jslaby@suse.cz>
Date: Tue, 4 May 2021 09:25:03 +0200
Subject: [PATCH] add boost tuple include to fix build

With boost 1.76, we see:
lib/engine/rs_ellipse.cpp:70:15: error: 'tuple' in namespace 'boost::math' does not name a template type
   70 |  boost::math::tuple<double, double, double> operator()(double const& z) const {
      |               ^~~~~

Fix this by including the proper boost header.
---
 librecad/src/lib/engine/rs_ellipse.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/librecad/src/lib/engine/rs_ellipse.cpp b/librecad/src/lib/engine/rs_ellipse.cpp
index 291f734ea..d47bf6ca4 100644
--- a/librecad/src/lib/engine/rs_ellipse.cpp
+++ b/librecad/src/lib/engine/rs_ellipse.cpp
@@ -48,6 +48,9 @@
 #include <boost/version.hpp>
 #include <boost/math/tools/roots.hpp>
 #include <boost/math/special_functions/ellint_2.hpp>
+#if BOOST_VERSION > 104500
+#include <boost/math/tools/tuple.hpp>
+#endif
 #endif
 
 namespace{