Scripts in utils are now automatically converted. They may not work at the moment though

Makefile

@@ -2,17 +2,17 @@ PYTHON ?= python3
 
 export PYTHONPATH = $(shell echo "$$PYTHONPATH"):./sphinx
 
-.PHONY: all check clean clean-pyc clean-patchfiles pylint reindent test
+.PHONY: all check clean clean-pyc clean-patchfiles clean-generated pylint reindent test
 
 all: clean-pyc check test
 
-check:
+check: convert-utils
 	@$(PYTHON) utils/check_sources.py -i build -i dist -i sphinx/style/jquery.js \
 		-i sphinx/pycode/pgen2 -i sphinx/util/smartypants.py -i .ropeproject \
 		-i doc/_build -i ez_setup.py -i tests/path.py -i tests/coverage.py \
 		-i env -i .tox .
 
-clean: clean-pyc clean-patchfiles clean-backupfiles
+clean: clean-pyc clean-patchfiles clean-backupfiles clean-generated
 
 clean-pyc:
 	find . -name '*.pyc' -exec rm -f {} +
@@ -26,10 +26,13 @@ clean-backupfiles:
 	find . -name '*~' -exec rm -f {} +
 	find . -name '*.bak' -exec rm -f {} +
 
+clean-generated:
+	rm utils/*3.py*
+
 pylint:
 	@pylint --rcfile utils/pylintrc sphinx
 
-reindent:
+reindent: convert-utils
 	@$(PYTHON) utils/reindent.py -r -B .
 
 test: build
@@ -40,3 +43,6 @@ covertest: build
 
 build:
 	@$(PYTHON) setup.py build
+
+convert-utils:
+	@python3 utils/convert.py -i utils/convert.py utils/