diff -up maxima-5.43.2/doc/info/build_html.sh.in.orig maxima-5.43.2/doc/info/build_html.sh.in
--- maxima-5.43.2/doc/info/build_html.sh.in.orig	2020-01-26 21:36:51.000000000 -0700
+++ maxima-5.43.2/doc/info/build_html.sh.in	2020-07-03 16:08:26.384327976 -0600
@@ -46,7 +46,7 @@ do
   echo "filenamebase = \"$filenamebase\""
   cat $f
 done | @AWK@ '!/^@c / && !/^@c$/ && (/^@deffn/ || /^@defvr/ || /^@end deffn/ || /^@end defvr/ || /@category/ || /@node/ || /^filenamebase/)' | @SED@ -f @abs_srcdir@/extract_categories1.sed | @AWK@ -f @abs_srcdir@/extract_categories1.awk > make-categories.py 
-python make-categories.py 
+python3 make-categories.py 
 @SED@ -e 's/^@bye/@node Documentation Categories, , Function and Variable Index\n@chapter Documentation Categories/' @abs_srcdir@/maxima.texi > maxima.texi 
 ( for f in Category-*.texi; do echo '@include' $f; done ; echo @bye ) >> maxima.texi 
 
diff -up maxima-5.43.2/doc/info/de/extract_categories.sh.orig maxima-5.43.2/doc/info/de/extract_categories.sh
--- maxima-5.43.2/doc/info/de/extract_categories.sh.orig	2019-10-20 21:38:58.000000000 -0600
+++ maxima-5.43.2/doc/info/de/extract_categories.sh	2020-07-03 16:03:04.055746160 -0600
@@ -31,7 +31,7 @@ cat *.texi\
   | awk -F'$' -f $d/extract_categories1.awk \
   > tmp-make-categories.py
 
-${PYTHONBIN:-python} tmp-make-categories.py
+${PYTHONBIN:-python3} tmp-make-categories.py
 
 sed 's/^@bye//' $TARGET_TEXI > tmp-target.texi
 echo '@node Documentation Categories' >> tmp-target.texi
diff -up maxima-5.43.2/share/draw/vtk.lisp.orig maxima-5.43.2/share/draw/vtk.lisp
--- maxima-5.43.2/share/draw/vtk.lisp.orig	2019-10-20 21:38:58.000000000 -0600
+++ maxima-5.43.2/share/draw/vtk.lisp	2020-07-03 16:01:05.777903241 -0600
@@ -3114,7 +3114,7 @@
 
     ;; pull in requiered packages
     (format cmdstorage "~a~%~a~%~%~a~%~a~%~%~a~%~%"
-      "#!/usr/bin/env python"
+      "#!/usr/bin/python3"
       "# -*- coding: UTF-8 -*-"
       "import vtk"
       "import sys"
@@ -3134,8 +3134,6 @@
     #+(or windows win32 win64)
     ($system "vtkpython " gfn)
     #-(or windows win32 win64)
-    (if (member $draw_renderer '($vtk $vtk6))
-      ($system (format nil "(python \"~a\")&" gfn))
-      ($system (format nil "(python3 \"~a\")&" gfn)))
+    ($system (format nil "(python3 \"~a\")&" gfn))
 
     '$done))