diff -Nru pyqwt3d-0.1.8/debian/changelog pyqwt3d-0.1.8/debian/changelog
--- pyqwt3d-0.1.8/debian/changelog	2019-01-07 12:42:59.000000000 +0000
+++ pyqwt3d-0.1.8/debian/changelog	2019-01-09 05:55:28.000000000 +0000
@@ -1,3 +1,10 @@
+pyqwt3d (0.1.8-4) unstable; urgency=medium
+
+  * Add -Wno-narrowing to OpenGL makefile, fixes FTBFS.
+    Thanks to Christian Seiler (Closes: #918680)
+
+ -- Gudjon I. Gudjonsson <gudjon@gudjon.org>  Wed, 09 Jan 2019 06:55:28 +0100
+
 pyqwt3d (0.1.8-3) unstable; urgency=medium
 
   * Remove hardcoding of qt_inc_dir with 01_configure patch,
diff -Nru pyqwt3d-0.1.8/debian/patches/01_configure.patch pyqwt3d-0.1.8/debian/patches/01_configure.patch
--- pyqwt3d-0.1.8/debian/patches/01_configure.patch	2019-01-07 12:42:59.000000000 +0000
+++ pyqwt3d-0.1.8/debian/patches/01_configure.patch	2019-01-09 05:55:28.000000000 +0000
@@ -71,3 +71,12 @@
  
  def get_pyqt_configuration(options):
      """Return the PyQt configuration for Qt3 or Qt4
+@@ -456,7 +487,7 @@
+             )
+ 
+     makefile.extra_cflags.extend(options.extra_cflags)
+-    makefile.extra_cxxflags.extend(options.extra_cxxflags)
++    makefile.extra_cxxflags.extend(options.extra_cxxflags+["-Wno-narrowing"])
+     makefile.extra_defines.extend(options.extra_defines)
+     makefile.extra_include_dirs.extend(options.extra_include_dirs)
+     makefile.extra_lflags.extend(options.extra_lflags)