diff -Nru doomsday-1.15.8/debian/changelog doomsday-1.15.8/debian/changelog
--- doomsday-1.15.8/debian/changelog	2016-10-09 18:15:23.000000000 +0200
+++ doomsday-1.15.8/debian/changelog	2017-06-27 20:59:36.000000000 +0200
@@ -1,3 +1,15 @@
+doomsday (1.15.8-3ubuntu0.1) zesty; urgency=medium
+
+  * Add patches to fix the following issues:
+    - segfault on startup (Closes: #847651. Fixes LP: #1700822)
+    - segfault when attempting to start a new game (Closes: #863536)
+    - make the build reproducible (Closes: #858333)
+  * Effectively this adds the same patches as in 1.15.8-5, therefore
+    the reproducible build patch is included as well to keep the delta
+    to that version to a minimum.
+
+ -- Hans Joachim Desserud <ubuntu@desserud.org>  Tue, 27 Jun 2017 20:59:36 +0200
+
 doomsday (1.15.8-3) unstable; urgency=medium
 
   * Team upload.
diff -Nru doomsday-1.15.8/debian/patches/mo-thinker-NULL-pointer.patch doomsday-1.15.8/debian/patches/mo-thinker-NULL-pointer.patch
--- doomsday-1.15.8/debian/patches/mo-thinker-NULL-pointer.patch	1970-01-01 01:00:00.000000000 +0100
+++ doomsday-1.15.8/debian/patches/mo-thinker-NULL-pointer.patch	2017-06-27 20:52:27.000000000 +0200
@@ -0,0 +1,24 @@
+From: Bernhard Übelacker <bernhardu@mailbox.org>
+Date: Thu, 1 Jun 2017 23:39:34 +0200
+Subject: mo thinker NULL pointer
+
+Bug-Debian: https://bugs.debian.org/863536
+Forwarded: no
+---
+ doomsday/client/src/client/cl_mobj.cpp | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/doomsday/client/src/client/cl_mobj.cpp b/doomsday/client/src/client/cl_mobj.cpp
+index 1f207f5..f57270d 100644
+--- a/doomsday/client/src/client/cl_mobj.cpp
++++ b/doomsday/client/src/client/cl_mobj.cpp
+@@ -211,6 +211,9 @@ void Cl_UpdateRealPlayerMobj(mobj_t *localMobj, mobj_t *remoteClientMobj,
+ 
+ dd_bool Cl_IsClientMobj(mobj_t const *mo)
+ {
++    if(!mo->thinker.d)
++        return false;
++
+     if(ClientMobjThinkerData *data = THINKER_DATA_MAYBE(mo->thinker, ClientMobjThinkerData))
+     {
+         return data->hasRemoteSync();
diff -Nru doomsday-1.15.8/debian/patches/Node-parent-NULL-pointer.patch doomsday-1.15.8/debian/patches/Node-parent-NULL-pointer.patch
--- doomsday-1.15.8/debian/patches/Node-parent-NULL-pointer.patch	1970-01-01 01:00:00.000000000 +0100
+++ doomsday-1.15.8/debian/patches/Node-parent-NULL-pointer.patch	2017-06-27 20:52:27.000000000 +0200
@@ -0,0 +1,24 @@
+From: Bernhard Übelacker <bernhardu@mailbox.org>
+Date: Tue, 23 May 2017 15:06:55 +0200
+Subject: Node parent NULL pointer
+
+Bug-Debian: https://bugs.debian.org/847651
+Forwarded: no
+---
+ doomsday/libcore/src/filesys/file.cpp | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/doomsday/libcore/src/filesys/file.cpp b/doomsday/libcore/src/filesys/file.cpp
+index fd9b8dc..a4a21c5 100644
+--- a/doomsday/libcore/src/filesys/file.cpp
++++ b/doomsday/libcore/src/filesys/file.cpp
+@@ -111,6 +111,9 @@ FileSystem &File::fileSystem()
+ 
+ Folder *File::parent() const
+ {
++    if (!Node::parent())
++        return NULL;
++
+     return Node::parent()->maybeAs<Folder>();
+ }
+ 
diff -Nru doomsday-1.15.8/debian/patches/reproducible-build.patch doomsday-1.15.8/debian/patches/reproducible-build.patch
--- doomsday-1.15.8/debian/patches/reproducible-build.patch	1970-01-01 01:00:00.000000000 +0100
+++ doomsday-1.15.8/debian/patches/reproducible-build.patch	2017-06-27 20:52:27.000000000 +0200
@@ -0,0 +1,38 @@
+From: Chris Lamb <lamby@debian.org>
+Date: Fri, 2 Jun 2017 00:22:54 +0200
+Subject: reproducible build
+
+Debian-Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=858333
+Forwarded: https://github.com/skyjake/Doomsday-Engine/pull/16
+---
+ doomsday/build/scripts/buildpackage.py | 9 ++++++---
+ 1 file changed, 6 insertions(+), 3 deletions(-)
+
+diff --git a/doomsday/build/scripts/buildpackage.py b/doomsday/build/scripts/buildpackage.py
+index 5e76928..133384d 100755
+--- a/doomsday/build/scripts/buildpackage.py
++++ b/doomsday/build/scripts/buildpackage.py
+@@ -7,7 +7,7 @@
+ #   buildpackage (pack-dir) (output-dir)
+ #
+ 
+-import sys, os, os.path, zipfile
++import sys, os, os.path, zipfile, time
+ 
+ if len(sys.argv) < 2:
+     print "Usage: %s (pack-dir) (output-dir)" % sys.argv[0]
+@@ -58,9 +58,12 @@ class Package:
+             sys.exit(1)
+         
+         # Write entries in alphabetical order.
++        date_time = time.localtime(int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))
+         for full, internal in sorted(contents):
+-            os.chmod(full, 0644)
+-            pack.write(full, internal)
++            info = zipfile.ZipInfo(internal, date_time)
++            info.external_attr = 0644 << 16L
++            with open(full, 'rb') as f:
++                pack.writestr(info, f.read())
+             
+         # Write it out.
+         print "Wrote %s (contains %i files)." % (outputName, len(pack.namelist()))
diff -Nru doomsday-1.15.8/debian/patches/series doomsday-1.15.8/debian/patches/series
--- doomsday-1.15.8/debian/patches/series	2016-10-09 18:15:23.000000000 +0200
+++ doomsday-1.15.8/debian/patches/series	2017-06-27 20:52:27.000000000 +0200
@@ -9,3 +9,6 @@
 no-libexample.patch
 no-timestamps.patch
 no-shlibexits.patch
+Node-parent-NULL-pointer.patch
+mo-thinker-NULL-pointer.patch
+reproducible-build.patch