Boost/1.76.0: Fix missing header (was added in boost/1.77.0)

recipes/boost/all/conandata.yml

@@ -161,6 +161,10 @@ patches:
     - patch_file: "patches/1.69.0-locale-no-system.patch"
       patch_description: "This library links to boost_system, even though that library is header-only"
       patch_type: "conan"
+    - patch_file: "patches/1.76.0-0001-fix-include-inside-boost-namespace.patch"
+      patch_description: "Fix #include inside boost namespace"
+      patch_type: "bugfix"
+      patch_source: "https://github.com/boostorg/math/pull/670"
     - patch_file: "patches/1.77.0-type_erasure-no-system.patch"
       patch_description: "This library links to boost_system, even though that library is header-only"
       patch_type: "conan"

recipes/boost/all/patches/1.76.0-0001-fix-include-inside-boost-namespace.patch

@@ -0,0 +1,33 @@
+From 1ec5c98d80de97f9e962c5627e1a0e6096099894 Mon Sep 17 00:00:00 2001
+From: Daniel Scharrer <daniel@constexpr.org>
+Date: Wed, 28 Jul 2021 19:56:31 +0200
+Subject: [PATCH] Fix #include inside boost namespace
+
+The existing code fails to build if <utility> was not already included.
+---
+ boost/math/tools/mp.hpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/boost/math/tools/mp.hpp b/boost/math/tools/mp.hpp
+index 35565646f..dc8440988 100644
+--- a/boost/math/tools/mp.hpp
++++ b/boost/math/tools/mp.hpp
+@@ -13,6 +13,7 @@
+
+ #include <type_traits>
+ #include <cstddef>
++#include <utility>
+
+ namespace boost { namespace math { namespace tools { namespace meta_programming {
+
+@@ -338,7 +339,6 @@ using mp_remove_if_q = mp_remove_if<L, Q::template fn>;
+ // Index sequence
+ // Use C++14 index sequence if available
+ #if defined(__cpp_lib_integer_sequence) && (__cpp_lib_integer_sequence >= 201304)
+-#include <utility>
+ template<std::size_t... I>
+ using index_sequence = std::index_sequence<I...>;
+
+-- 
+2.39.1
+