Fix the reindent rule to use $(BUILDPYTHON).
diff --git a/Makefile.pre.in b/Makefile.pre.in
index c444539..ec7c0d8 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1025,7 +1025,7 @@
 
 # Run reindent on the library
 reindent:
-	./python$(EXEEXT) $(srcdir)/Tools/scripts/reindent.py -r $(srcdir)/Lib
+	./$(BUILDPYTHON) $(srcdir)/Tools/scripts/reindent.py -r $(srcdir)/Lib
 
 # Rerun configure with the same options as it was run last time,
 # provided the config.status script exists