diff -ur a/lib/configure.py b/lib/configure.py
--- a/lib/configure.py	2018-08-28 21:49:44.000000000 +0200
+++ b/lib/configure.py	2018-08-29 23:44:58.310928948 +0200
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/python3
 # -*- coding: utf-8 -*-
 #
 # file configure.py
diff -ur a/lib/lyx2lyx/lyx2lyx b/lib/lyx2lyx/lyx2lyx
--- a/lib/lyx2lyx/lyx2lyx	2018-08-28 21:49:44.000000000 +0200
+++ b/lib/lyx2lyx/lyx2lyx	2018-08-29 23:46:17.080401969 +0200
@@ -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 a/lib/lyx2lyx/profiling.py b/lib/lyx2lyx/profiling.py
--- a/lib/lyx2lyx/profiling.py	2018-08-28 21:49:44.000000000 +0200
+++ b/lib/lyx2lyx/profiling.py	2018-08-29 23:46:36.432763866 +0200
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/python3
 # -*- coding: utf-8 -*-
 # Copyright (C) 2004 José Matos <jamatos@lyx.org>
 #
diff -ur a/lib/scripts/listerrors b/lib/scripts/listerrors
--- a/lib/scripts/listerrors	2018-08-28 21:49:44.000000000 +0200
+++ b/lib/scripts/listerrors	2018-08-29 23:47:06.305322496 +0200
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 
 # file listerrors
 # This file is part of LyX, the document processor.
diff -ur a/lib/scripts/svg2pdftex.py b/lib/scripts/svg2pdftex.py
--- a/lib/scripts/svg2pdftex.py	2018-08-28 21:49:44.000000000 +0200
+++ b/lib/scripts/svg2pdftex.py	2018-08-29 23:47:27.381716633 +0200
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file svg2pdftex.py
diff -ur a/lib/scripts/svg2pstex.py b/lib/scripts/svg2pstex.py
--- a/lib/scripts/svg2pstex.py	2018-08-28 21:49:44.000000000 +0200
+++ b/lib/scripts/svg2pstex.py	2018-08-29 23:47:42.970008140 +0200
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # file svg2pstex.py