diff -Nru boost1.65.1-1.65.1+dfsg/debian/changelog boost1.65.1-1.65.1+dfsg/debian/changelog
--- boost1.65.1-1.65.1+dfsg/debian/changelog	2018-11-13 08:09:32.000000000 +0000
+++ boost1.65.1-1.65.1+dfsg/debian/changelog	2019-11-29 08:52:13.000000000 +0000
@@ -1,39 +1,10 @@
-boost1.65.1 (1.65.1+dfsg-0ubuntu11) disco; urgency=medium
+boost1.65.1 (1.65.1+dfsg-0ubuntu5~16.04.sav0) xenial; urgency=medium
 
-  * No-change rebuild for icu soname changes.
+  * Backport to Xenial
+  * debian/rules: Add "JAM_OPT += cxxflags=-std=c++11" due build failure on
+    Xenial (GCC 5.4.0) with no boost fiber
 
- -- Matthias Klose <doko@ubuntu.com>  Tue, 13 Nov 2018 08:09:32 +0000
-
-boost1.65.1 (1.65.1+dfsg-0ubuntu10) disco; urgency=medium
-
-  * No-change rebuild to build for python3.7 as the default.
-
- -- Matthias Klose <doko@ubuntu.com>  Tue, 30 Oct 2018 18:19:15 +0000
-
-boost1.65.1 (1.65.1+dfsg-0ubuntu9) cosmic; urgency=medium
-
-  * Drop building with -fpermissive.
-  * Apply upstream patch for py3.7 compat.
-
- -- Dimitri John Ledkov 🌈 <xnox@ubuntu.com>  Fri, 29 Jun 2018 13:14:41 +0100
-
-boost1.65.1 (1.65.1+dfsg-0ubuntu8) cosmic; urgency=medium
-
-  * Build with -fpermissive for now.
-
- -- Matthias Klose <doko@ubuntu.com>  Fri, 29 Jun 2018 12:04:01 +0200
-
-boost1.65.1 (1.65.1+dfsg-0ubuntu7) cosmic; urgency=medium
-
-  * No-change rebuild to add python3.7 support.
-
- -- Matthias Klose <doko@ubuntu.com>  Fri, 29 Jun 2018 05:39:52 +0200
-
-boost1.65.1 (1.65.1+dfsg-0ubuntu6) cosmic; urgency=medium
-
-  * No-change rebuild for dune openmpi soname change.
-
- -- Matthias Klose <doko@ubuntu.com>  Sun, 13 May 2018 16:59:31 +0000
+ -- Rob Savoury <savourytech@use.startmail.com>  Fri, 29 Nov 2019 00:52:13 -0800
 
 boost1.65.1 (1.65.1+dfsg-0ubuntu5) bionic; urgency=medium
 
diff -Nru boost1.65.1-1.65.1+dfsg/debian/patches/660487c43fde76f3e64f1cb2e644500da92fe582.patch boost1.65.1-1.65.1+dfsg/debian/patches/660487c43fde76f3e64f1cb2e644500da92fe582.patch
--- boost1.65.1-1.65.1+dfsg/debian/patches/660487c43fde76f3e64f1cb2e644500da92fe582.patch	2018-06-29 12:13:46.000000000 +0000
+++ boost1.65.1-1.65.1+dfsg/debian/patches/660487c43fde76f3e64f1cb2e644500da92fe582.patch	1970-01-01 00:00:00.000000000 +0000
@@ -1,39 +0,0 @@
-From 660487c43fde76f3e64f1cb2e644500da92fe582 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Bernhard=20Rosenkr=C3=A4nzer?= <bero@lindev.ch>
-Date: Fri, 9 Feb 2018 18:20:30 +0100
-Subject: [PATCH] Fix build with Python 3.7
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Python 3.7 changes the return type of _PyUnicode_AsString()
-from void* to const char* -- causing the build of boost-python
-to fail.
-
-Signed-off-by: Bernhard Rosenkränzer <bero@lindev.ch>
----
- src/converter/builtin_converters.cpp | 7 ++++++-
- 1 file changed, 6 insertions(+), 1 deletion(-)
-
-diff --git a/libs/python/src/converter/builtin_converters.cpp b/libs/python/src/converter/builtin_converters.cpp
-index 1c28af7fc..ee2d5b479 100644
---- a/libs/python/src/converter/builtin_converters.cpp
-+++ b/libs/python/src/converter/builtin_converters.cpp
-@@ -45,11 +45,16 @@ namespace
-   {
-       return PyString_Check(obj) ? PyString_AsString(obj) : 0;
-   }
--#else
-+#elif PY_VERSION_HEX < 0x03070000
-   void* convert_to_cstring(PyObject* obj)
-   {
-       return PyUnicode_Check(obj) ? _PyUnicode_AsString(obj) : 0;
-   }
-+#else
-+  void* convert_to_cstring(PyObject* obj)
-+  {
-+      return PyUnicode_Check(obj) ? const_cast<void*>(reinterpret_cast<const void*>(_PyUnicode_AsString(obj))) : 0;
-+  }
- #endif
- 
-   // Given a target type and a SlotPolicy describing how to perform a
diff -Nru boost1.65.1-1.65.1+dfsg/debian/patches/series boost1.65.1-1.65.1+dfsg/debian/patches/series
--- boost1.65.1-1.65.1+dfsg/debian/patches/series	2018-06-29 12:13:46.000000000 +0000
+++ boost1.65.1-1.65.1+dfsg/debian/patches/series	2017-10-24 15:08:07.000000000 +0000
@@ -5,4 +5,3 @@
 no-gcc-m-options.diff
 no-gcc-march-options.patch
 make-docs-use-offline-resources-only.patch
-660487c43fde76f3e64f1cb2e644500da92fe582.patch
diff -Nru boost1.65.1-1.65.1+dfsg/debian/rules boost1.65.1-1.65.1+dfsg/debian/rules
--- boost1.65.1-1.65.1+dfsg/debian/rules	2018-06-29 12:14:04.000000000 +0000
+++ boost1.65.1-1.65.1+dfsg/debian/rules	2019-11-29 08:52:13.000000000 +0000
@@ -1,5 +1,8 @@
 #! /usr/bin/make -f
 
+# Ensure ISO C++ 2011 standard for Xenial build (GCC 5.4.0)
+JAM_OPT += cxxflags=-std=c++11
+
 # Boost libraries for which we want separate packages
 # context is conditionally compiled because it is not supported yet on several architectures
 # coroutine, and fiber depend on context, so they are also conditionally compiled