-deps = -rdocs/requirements-docs.txt
-commands = sphinx-build -q -W -b linkcheck -d {envtmpdir}/doctrees ./docs/ {toxinidir}/docs/_build/linkcheck
+basepython = python3.8
+deps =
+ -r{toxinidir}/requirements.txt
+ -chttps://releases.openstack.org/constraints/upper/yoga
+ -chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt
+allowlist_externals = sudo
+commands =
+ sudo apt install graphviz
+ sphinx-build -q -W -b linkcheck -d {envtmpdir}/doctrees ./docs/ {toxinidir}/docs/_build/linkcheck