diff -Nru xdrawchem-2.0/debian/changelog xdrawchem-2.0/debian/changelog
--- xdrawchem-2.0/debian/changelog	2016-02-18 12:55:24.000000000 +0000
+++ xdrawchem-2.0/debian/changelog	2016-06-30 12:24:41.000000000 +0000
@@ -1,3 +1,11 @@
+xdrawchem (2.0-5) unstable; urgency=medium
+
+  * prepared for GCC6: patched xdrawchem/molecule_obmol.cpp,
+    checked the compilation with QT_CXX = g++-6. Closes: #811675
+  * upgraded Standards-Version to 3.9.8
+
+ -- Georges Khaznadar <georgesk@debian.org>  Thu, 30 Jun 2016 12:26:08 +0200
+
 xdrawchem (2.0-4) unstable; urgency=medium
 
   * added a very simple desktop file. Closes: #708578
@@ -339,6 +347,4 @@
 
  -- Warren Stramiello <stramiello@debian.org>  Wed,  9 May 2001 16:02:28 -0400
 
-Local variables:
-mode: debian-changelog
-End:
+
diff -Nru xdrawchem-2.0/debian/control xdrawchem-2.0/debian/control
--- xdrawchem-2.0/debian/control	2014-10-05 16:33:02.000000000 +0000
+++ xdrawchem-2.0/debian/control	2016-06-30 12:17:15.000000000 +0000
@@ -6,7 +6,7 @@
 Build-Depends: debhelper (>= 9), quilt, bash (>= 4.0), pkg-config,
  libqt4-dev, kdelibs5-dev,
  libopenbabel-dev (>= 2.0.0)
-Standards-Version: 3.9.5
+Standards-Version: 3.9.8
 
 Package: xdrawchem
 Architecture: any
diff -Nru xdrawchem-2.0/debian/patches/gcc6.patch xdrawchem-2.0/debian/patches/gcc6.patch
--- xdrawchem-2.0/debian/patches/gcc6.patch	1970-01-01 00:00:00.000000000 +0000
+++ xdrawchem-2.0/debian/patches/gcc6.patch	2016-06-30 12:15:13.000000000 +0000
@@ -0,0 +1,22 @@
+Index: xdrawchem-2.0/xdrawchem/molecule_obmol.cpp
+===================================================================
+--- xdrawchem-2.0.orig/xdrawchem/molecule_obmol.cpp
++++ xdrawchem-2.0/xdrawchem/molecule_obmol.cpp
+@@ -219,7 +219,7 @@ OBMol *Molecule::convertToOBMol()
+         atom.SetType( type );
+ 
+         if ( !obmol->AddAtom( atom ) )
+-            return ( false );
++            return ( NULL );
+         atom.Clear();
+     }
+ 
+@@ -236,7 +236,7 @@ OBMol *Molecule::convertToOBMol()
+         if ( bst == STEREO_DOWN )
+             flag |= OB_HASH_BOND;
+         if ( !obmol->AddBond( start, end, order, flag ) )
+-            return ( false );
++            return ( NULL );
+     }
+ 
+     obmol->EndModify();
diff -Nru xdrawchem-2.0/debian/patches/series xdrawchem-2.0/debian/patches/series
--- xdrawchem-2.0/debian/patches/series	2016-02-18 12:54:03.000000000 +0000
+++ xdrawchem-2.0/debian/patches/series	2016-06-30 11:57:40.000000000 +0000
@@ -4,3 +4,4 @@
 hardening.patch
 desktop.patch
 nl-po.patch
+gcc6.patch
diff -Nru xdrawchem-2.0/debian/rules xdrawchem-2.0/debian/rules
--- xdrawchem-2.0/debian/rules	2016-02-18 13:50:17.000000000 +0000
+++ xdrawchem-2.0/debian/rules	2016-06-30 11:55:15.000000000 +0000
@@ -12,12 +12,6 @@
 %:
 	dh $@ 
 
-#override_dh_auto_configure:
-#	./configure --prefix=/usr
-
-
-
-
 override_dh_auto_clean:
 	dh_auto_clean
 	rm -f config.mak