diff -Nru nomacs-3.12.0+dfsg/debian/changelog nomacs-3.12.0+dfsg/debian/changelog
--- nomacs-3.12.0+dfsg/debian/changelog	2018-11-13 19:20:42.000000000 +0000
+++ nomacs-3.12.0+dfsg/debian/changelog	2020-02-06 01:30:16.000000000 +0000
@@ -1,3 +1,9 @@
+nomacs (3.12.0+dfsg-2+rpi1) bullseye-staging; urgency=medium
+
+  * Add missing <iostream> include.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Thu, 06 Feb 2020 01:30:16 +0000
+
 nomacs (3.12.0+dfsg-2) unstable; urgency=medium
 
   * Removed not needed patches
diff -Nru nomacs-3.12.0+dfsg/debian/patches/add-missing-iostream-include.patch nomacs-3.12.0+dfsg/debian/patches/add-missing-iostream-include.patch
--- nomacs-3.12.0+dfsg/debian/patches/add-missing-iostream-include.patch	1970-01-01 00:00:00.000000000 +0000
+++ nomacs-3.12.0+dfsg/debian/patches/add-missing-iostream-include.patch	2020-02-06 01:30:16.000000000 +0000
@@ -0,0 +1,40 @@
+Description:  Add missing <iostream> include.
+Author: Peter Michael Green <plugwash@raspbian.org>
+
+---
+The information above should follow the Patch Tagging Guidelines, please
+checkout http://dep.debian.net/deps/dep3/ to learn about the format. Here
+are templates for supplementary fields that you might want to add:
+
+Origin: <vendor|upstream|other>, <url of original patch>
+Bug: <url in upstream bugtracker>
+Bug-Debian: https://bugs.debian.org/<bugnumber>
+Bug-Ubuntu: https://launchpad.net/bugs/<bugnumber>
+Forwarded: <no|not-needed|url proving that it has been forwarded>
+Reviewed-By: <name and email of someone who approved the patch>
+Last-Update: 2020-02-06
+
+Index: nomacs-3.12.0+dfsg/src/DkGui/DkNoMacs.cpp
+===================================================================
+--- nomacs-3.12.0+dfsg.orig/src/DkGui/DkNoMacs.cpp
++++ nomacs-3.12.0+dfsg/src/DkGui/DkNoMacs.cpp
+@@ -86,6 +86,7 @@
+ #include <QNetworkProxyFactory>
+ #include <QInputDialog>
+ #include <QApplication>
++#include <iostream>
+ #pragma warning(pop)		// no warnings from includes - end
+ 
+ #if defined(Q_OS_WIN) && !defined(SOCK_STREAM)
+Index: nomacs-3.12.0+dfsg/src/DkCore/DkMetaData.cpp
+===================================================================
+--- nomacs-3.12.0+dfsg.orig/src/DkCore/DkMetaData.cpp
++++ nomacs-3.12.0+dfsg/src/DkCore/DkMetaData.cpp
+@@ -40,6 +40,7 @@
+ #include <QBuffer>
+ #include <QVector2D>
+ #include <QApplication>
++#include <iostream>
+ #pragma warning(pop)		// no warnings from includes - end
+ 
+ namespace nmc {
diff -Nru nomacs-3.12.0+dfsg/debian/patches/series nomacs-3.12.0+dfsg/debian/patches/series
--- nomacs-3.12.0+dfsg/debian/patches/series	1970-01-01 00:00:00.000000000 +0000
+++ nomacs-3.12.0+dfsg/debian/patches/series	2020-02-06 01:30:16.000000000 +0000
@@ -0,0 +1 @@
+add-missing-iostream-include.patch