graphics/librecad: Fix building with the newer boost.

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

graphics/librecad/0003-add-boost-tuple-include-to-fix-build.patch

@@ -0,0 +1,29 @@
+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{

graphics/librecad/librecad.SlackBuild

@@ -84,6 +84,9 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
+# thnx Archlinux!
+patch -p1 < $CWD/0003-add-boost-tuple-include-to-fix-build.patch
+
 qmake-qt5 $PRGNAM.pro QMAKE_CFLAGS+="$SLKCFLAGS" QMAKE_CXXFLAGS+="$SLKCFLAGS"
 make