diff -ur lyx-2.3.2.orig/development/cmake/doc/ReplaceValues.py lyx-2.3.2/development/cmake/doc/ReplaceValues.py
--- lyx-2.3.2.orig/development/cmake/doc/ReplaceValues.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/cmake/doc/ReplaceValues.py	2018-12-11 11:15:32.527483449 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 
 from __future__ import print_function
 
diff -ur lyx-2.3.2.orig/development/cmake/po/cat.py lyx-2.3.2/development/cmake/po/cat.py
--- lyx-2.3.2.orig/development/cmake/po/cat.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/cmake/po/cat.py	2018-12-11 11:15:32.526483446 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 
 from __future__ import print_function
 
diff -ur lyx-2.3.2.orig/development/cmake/po/unix2dos.py lyx-2.3.2/development/cmake/po/unix2dos.py
--- lyx-2.3.2.orig/development/cmake/po/unix2dos.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/cmake/po/unix2dos.py	2018-12-11 11:15:32.526483446 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 
 ###############
 import sys
diff -ur lyx-2.3.2.orig/development/tools/generate_symbols_images.py lyx-2.3.2/development/tools/generate_symbols_images.py
--- lyx-2.3.2.orig/development/tools/generate_symbols_images.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/tools/generate_symbols_images.py	2018-12-11 11:15:32.530483457 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file generate_symbols_images.py
diff -ur lyx-2.3.2.orig/development/tools/generate_symbols_list.py lyx-2.3.2/development/tools/generate_symbols_list.py
--- lyx-2.3.2.orig/development/tools/generate_symbols_list.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/tools/generate_symbols_list.py	2018-12-11 11:15:32.528483451 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file generate_symbols_images.py
diff -ur lyx-2.3.2.orig/development/tools/gen_lfuns.py lyx-2.3.2/development/tools/gen_lfuns.py
--- lyx-2.3.2.orig/development/tools/gen_lfuns.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/tools/gen_lfuns.py	2018-12-11 11:15:32.529483454 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file gen_lfuns.py
diff -ur lyx-2.3.2.orig/development/tools/mergepo.py lyx-2.3.2/development/tools/mergepo.py
--- lyx-2.3.2.orig/development/tools/mergepo.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/tools/mergepo.py	2018-12-11 11:15:32.527483449 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file mergepo.py
diff -ur lyx-2.3.2.orig/development/tools/unicodesymbols.py lyx-2.3.2/development/tools/unicodesymbols.py
--- lyx-2.3.2.orig/development/tools/unicodesymbols.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/tools/unicodesymbols.py	2018-12-11 11:15:32.529483454 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file unciodesymbols.py
diff -ur lyx-2.3.2.orig/development/tools/updatedocs.py lyx-2.3.2/development/tools/updatedocs.py
--- lyx-2.3.2.orig/development/tools/updatedocs.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/tools/updatedocs.py	2018-12-11 11:15:32.529483454 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file updatedocs.py
diff -ur lyx-2.3.2.orig/development/tools/updatelayouts.py lyx-2.3.2/development/tools/updatelayouts.py
--- lyx-2.3.2.orig/development/tools/updatelayouts.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/development/tools/updatelayouts.py	2018-12-11 11:15:32.527483449 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file updatelayouts.py
diff -ur lyx-2.3.2.orig/lib/configure.py lyx-2.3.2/lib/configure.py
--- lyx-2.3.2.orig/lib/configure.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/lib/configure.py	2018-12-11 11:15:32.536483473 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 #
 # file configure.py
diff -ur lyx-2.3.2.orig/lib/lyx2lyx/lyx2lyx lyx-2.3.2/lib/lyx2lyx/lyx2lyx
--- lyx-2.3.2.orig/lib/lyx2lyx/lyx2lyx	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/lib/lyx2lyx/lyx2lyx	2018-12-11 11:15:32.537483475 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 # Copyright (C) 2002-2011 The LyX Team
 # Copyright (C) 2002-2007 José Matos <jamatos@lyx.org>
diff -ur lyx-2.3.2.orig/lib/lyx2lyx/profiling.py lyx-2.3.2/lib/lyx2lyx/profiling.py
--- lyx-2.3.2.orig/lib/lyx2lyx/profiling.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/lib/lyx2lyx/profiling.py	2018-12-11 11:15:32.538483478 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 # Copyright (C) 2004 José Matos <jamatos@lyx.org>
 #
diff -ur lyx-2.3.2.orig/lib/scripts/gnuplot2pdf.py lyx-2.3.2/lib/scripts/gnuplot2pdf.py
--- lyx-2.3.2.orig/lib/scripts/gnuplot2pdf.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/lib/scripts/gnuplot2pdf.py	2018-12-11 11:15:01.032400237 +0000
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 from subprocess import Popen, PIPE
 from sys import argv, stderr, exit
diff -ur lyx-2.3.2.orig/lib/scripts/listerrors lyx-2.3.2/lib/scripts/listerrors
--- lyx-2.3.2.orig/lib/scripts/listerrors	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/lib/scripts/listerrors	2018-12-11 12:55:27.649147444 +0000
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 
 # file listerrors
 # This file is part of LyX, the document processor.
diff -ur lyx-2.3.2.orig/lib/scripts/svg2pdftex.py lyx-2.3.2/lib/scripts/svg2pdftex.py
--- lyx-2.3.2.orig/lib/scripts/svg2pdftex.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/lib/scripts/svg2pdftex.py	2018-12-11 12:57:35.817461831 +0000
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file svg2pdftex.py
diff -ur lyx-2.3.2.orig/lib/scripts/svg2pstex.py lyx-2.3.2/lib/scripts/svg2pstex.py
--- lyx-2.3.2.orig/lib/scripts/svg2pstex.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/lib/scripts/svg2pstex.py	2018-12-11 12:57:08.881395754 +0000
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file svg2pstex.py
diff -ur lyx-2.3.2.orig/po/lyx_pot.py lyx-2.3.2/po/lyx_pot.py
--- lyx-2.3.2.orig/po/lyx_pot.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/po/lyx_pot.py	2018-12-11 12:54:59.674078823 +0000
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file lyx_pot.py
diff -ur lyx-2.3.2.orig/src/graphics/GraphicsConverter.cpp lyx-2.3.2/src/graphics/GraphicsConverter.cpp
--- lyx-2.3.2.orig/src/graphics/GraphicsConverter.cpp	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/src/graphics/GraphicsConverter.cpp	2018-12-11 12:56:36.345315949 +0000
@@ -287,7 +287,7 @@
 	LYXERR(Debug::GRAPHICS, "build_script ... ");
 	typedef Graph::EdgePath EdgePath;
 
-	script << "#!/usr/bin/env python\n"
+	script << "#!/usr/bin/python3\n"
 		  "# -*- coding: utf-8 -*-\n"
 		  "import os, shutil, sys\n\n"
 		  "def unlinkNoThrow(file):\n"
diff -ur lyx-2.3.2.orig/src/tex2lyx/test/runtests.py lyx-2.3.2/src/tex2lyx/test/runtests.py
--- lyx-2.3.2.orig/src/tex2lyx/test/runtests.py	2018-12-09 20:04:52.000000000 +0000
+++ lyx-2.3.2/src/tex2lyx/test/runtests.py	2018-12-11 11:15:32.532483462 +0000
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file src/tex2lyx/test/runtests.py