--- /dev/null
+From 3bfcb171026c4fd5c7caf807f79184a81c8af5b2 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?J=C3=B6rg=20Krause?= <joerg.krause@embedded.rocks>
+Date: Sun, 11 Sep 2016 21:09:22 +0200
+Subject: [PATCH] Check for std::future
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+std::future is not available for all architectures, e.g. it is missing
+for ARMv5 (soft-float).
+
+The problem is that libstdc++ only enables `std::future` if
+`ATOMIC_INT_LOCK_FREE > 1` which is not true for the ARMv5 target.
+
+As the future functionality is not used for much we just ifdef out the
+parts from `std::future`.
+
+Upstream-status: https://github.com/medoc92/libupnpp/issues/8
+
+This patch is squashed from two upstream commits:
+1/ d3e3cada667cca5b70693b351e5865231275dd82
+2/ 90407dcc206987c8e58d61c64db539489f0717d2
+
+Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
+---
+ configure.ac | 17 +++++++++++++++++
+ libupnpp/config.h.in | 3 +++
+ libupnpp/workqueue.h | 14 +++++++++++++-
+ 3 files changed, 33 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 877a773..9ff2058 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -47,6 +47,23 @@ AC_DEFINE([_FILE_OFFSET_BITS], [64], [File Offset size])
+ AC_CHECK_LIB([rt], [clock_gettime], [], [])
+ AC_CHECK_LIB([pthread], [pthread_create], [], [])
+
++# Check that std::future is available.
++AC_LANG_PUSH([C++])
++CXXFLAGS="-std=c++11 $CXXFLAGS"
++AC_MSG_CHECKING([whether std::future is available])
++AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <future>]],
++ [[std::future<int> f;]])],
++ [ AC_DEFINE([HAVE_STD_FUTURE], [1],
++ [Define to 1 if you have the `std::future`.])
++ have_std_future=yes
++ ],
++ [
++ have_std_future=no
++ ]
++)
++AC_MSG_RESULT([$have_std_future])
++AC_LANG_POP
++
+ # The 2 following checks for libthreadutil and libixml are normally
+ # unnecessary and even problematic. libupnpp does not use them directly,
+ # and they should be used automatically because libupnpp is linked with them.
+diff --git a/libupnpp/config.h.in b/libupnpp/config.h.in
+index 39fa410..4471855 100644
+--- a/libupnpp/config.h.in
++++ b/libupnpp/config.h.in
+@@ -36,6 +36,9 @@
+ /* Define to 1 if you have the <stdlib.h> header file. */
+ #undef HAVE_STDLIB_H
+
++/* Define to 1 if you have the `std::future`. */
++#undef HAVE_STD_FUTURE
++
+ /* Define to 1 if you have the <strings.h> header file. */
+ #undef HAVE_STRINGS_H
+
+diff --git a/libupnpp/workqueue.h b/libupnpp/workqueue.h
+index 52a6138..9c0ec02 100644
+--- a/libupnpp/workqueue.h
++++ b/libupnpp/workqueue.h
+@@ -18,7 +18,9 @@
+ #define _WORKQUEUE_H_INCLUDED_
+
+ #include <thread>
++#if HAVE_STD_FUTURE
+ #include <future>
++#endif
+ #include <string>
+ #include <queue>
+ #include <list>
+@@ -76,10 +78,14 @@ public:
+ bool start(int nworkers, void *(workproc)(void *), void *arg) {
+ std::unique_lock<std::mutex> lock(m_mutex);
+ for (int i = 0; i < nworkers; i++) {
+- std::packaged_task<void *(void *)> task(workproc);
+ Worker w;
++#if HAVE_STD_FUTURE
++ std::packaged_task<void *(void *)> task(workproc);
+ w.res = task.get_future();
+ w.thr = std::thread(std::move(task), arg);
++#else
++ w.thr = std::thread(workproc, arg);
++#endif
+ m_worker_threads.push_back(std::move(w));
+ }
+ return true;
+@@ -189,7 +195,11 @@ public:
+ // Workers return (void*)1 if ok
+ void *statusall = (void*)1;
+ while (!m_worker_threads.empty()) {
++#if HAVE_STD_FUTURE
+ void *status = m_worker_threads.front().res.get();
++#else
++ void *status = (void*) 1;
++#endif
+ m_worker_threads.front().thr.join();
+ if (status == (void *)0) {
+ statusall = status;
+@@ -305,7 +315,9 @@ private:
+
+ struct Worker {
+ std::thread thr;
++#if HAVE_STD_FUTURE
+ std::future<void *> res;
++#endif
+ };
+
+ // Configuration
+--
+2.9.3
+
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