diff -Nru qsynth-0.5.0/debian/changelog qsynth-0.5.0/debian/changelog
--- qsynth-0.5.0/debian/changelog	2017-12-17 16:02:44.000000000 +0000
+++ qsynth-0.5.0/debian/changelog	2018-01-07 15:11:58.000000000 +0000
@@ -1,3 +1,11 @@
+qsynth (0.5.0-2) unstable; urgency=medium
+
+  * Add patch to fix FTCBFS. (Closes: #886543)
+  * Set dh/compat 11.
+  * Bump Standards.
+
+ -- Jaromír Mikeš <mira.mikes@seznam.cz>  Sun, 07 Jan 2018 16:11:58 +0100
+
 qsynth (0.5.0-1) unstable; urgency=medium
 
   * New upstream version 0.5.0
diff -Nru qsynth-0.5.0/debian/compat qsynth-0.5.0/debian/compat
--- qsynth-0.5.0/debian/compat	2016-11-14 22:54:28.000000000 +0000
+++ qsynth-0.5.0/debian/compat	2018-01-07 15:08:03.000000000 +0000
@@ -1 +1 @@
-10
+11
diff -Nru qsynth-0.5.0/debian/control qsynth-0.5.0/debian/control
--- qsynth-0.5.0/debian/control	2017-12-17 15:43:47.000000000 +0000
+++ qsynth-0.5.0/debian/control	2018-01-07 15:08:29.000000000 +0000
@@ -7,14 +7,14 @@
  Jaromír Mikeš <mira.mikes@seznam.cz>
 Build-Depends:
  cmake,
- debhelper (>= 10),
+ debhelper (>= 11~),
  pkg-config,
  qtbase5-dev,
  qttools5-dev-tools,
  libqt5x11extras5-dev,
  libfluidsynth-dev,
  libx11-dev
-Standards-Version: 4.1.2
+Standards-Version: 4.1.3
 Homepage: https://qsynth.sourceforge.io
 Vcs-Git: https://anonscm.debian.org/git/pkg-multimedia/qsynth.git
 Vcs-Browser: https://anonscm.debian.org/git/pkg-multimedia/qsynth.git
diff -Nru qsynth-0.5.0/debian/patches/5001-cross.patch qsynth-0.5.0/debian/patches/5001-cross.patch
--- qsynth-0.5.0/debian/patches/5001-cross.patch	1970-01-01 00:00:00.000000000 +0000
+++ qsynth-0.5.0/debian/patches/5001-cross.patch	2018-01-07 15:04:48.000000000 +0000
@@ -0,0 +1,24 @@
+Description: Fix FTCBFS: uses the build architecture qmake
+Author: Helmut Grohne <helmut@subdivi.de>
+Forwarded: Rui Nuno Capela <rncbc@rncbc.org>
+
+Index: qsynth/configure.ac
+===================================================================
+--- qsynth.orig/configure.ac
++++ qsynth/configure.ac
+@@ -202,12 +202,12 @@ done
+ ac_errmsg="not found in current PATH. Maybe QT development environment isn't available."
+ 
+ if test "x$ac_qt4" = "xyes"; then
+-   AC_PATH_PROG(ac_qmake, qmake-qt4, [no], $ac_path)
++   AC_PATH_TOOL(ac_qmake, qmake-qt4, [no], $ac_path)
+ else
+-   AC_PATH_PROG(ac_qmake, qmake-qt5, [no], $ac_path)
++   AC_PATH_TOOL(ac_qmake, qmake-qt5, [no], $ac_path)
+ fi
+ if test "x$ac_qmake" = "xno"; then
+-   AC_PATH_PROG(ac_cv_qmake, qmake, [no], $ac_path)
++   AC_PATH_TOOL(ac_cv_qmake, qmake, [no], $ac_path)
+    ac_qmake=$ac_cv_qmake
+ fi
+ if test "x$ac_qmake" = "xno"; then
diff -Nru qsynth-0.5.0/debian/patches/series qsynth-0.5.0/debian/patches/series
--- qsynth-0.5.0/debian/patches/series	2017-06-28 05:17:22.000000000 +0000
+++ qsynth-0.5.0/debian/patches/series	2018-01-07 15:00:38.000000000 +0000
@@ -1,2 +1,3 @@
 1001-soundfont_default_dir.patch
 3001-hardening.patch
+5001-cross.patch