diff --git a/makefiles/consts.mk b/makefiles/consts.mk
new file mode 100644
index 0000000..bac4362
--- /dev/null
+++ b/makefiles/consts.mk
@@ -0,0 +1,52 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+# include makefiles/constants.mk
+export dot          :=.
+export null         :=#
+export space        := $(null) $(null)
+export quote-single := $(null)"$(null)#"
+export quote-double := $(null)'$(null)#'
+
+# [DEBUG] make {target} HIDE=
+HIDE        ?= @
+
+env-clean      ?= /usr/bin/env --ignore-environment
+xargs-n1       := xargs -0 -t -n1 --no-run-if-empty
+xargs-n1-clean := $(env-clean) $(xargs-n1)
+
+## -----------------------------------------------------------------------
+## Default shell:
+##   o set -e            enable error checking
+##   o set -u            report undefined errors
+##   o set -o pipefail   propogate shell pipeline failures.
+## -----------------------------------------------------------------------
+SHELL ?= /bin/bash
+have-shell-bash := $(filter bash,$(subst /,$(space),$(SHELL)))
+$(if $(have-shell-bash),$(null),\
+  $(eval export SHELL := bash -euo pipefail))
+
+export SHELL ?= bash -euo pipefail
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/help/help-verbose.mk b/makefiles/help/help-verbose.mk
new file mode 100644
index 0000000..c77220f
--- /dev/null
+++ b/makefiles/help/help-verbose.mk
@@ -0,0 +1,31 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+# -----------------------------------------------------------------------
+# Intent: Provide verbose topic help
+#   - include library makefile(s)
+#   - define a local verbose-help target for the topic
+#   - Append target name to the makefile help-verbose macro:
+#     - help-verbose += {help-topic-target}
+#   - make help-verbose
+#
+# Pre: Include after all library makefile targets have been included
+# -----------------------------------------------------------------------
+
+help-verbose : $(help-verbose)
+
+# [EOF]
diff --git a/makefiles/help/include.mk b/makefiles/help/include.mk
new file mode 100644
index 0000000..d9e42c6
--- /dev/null
+++ b/makefiles/help/include.mk
@@ -0,0 +1,27 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+# Parent makefile should include this early so help
+# message will be prefixed by a usage statement.
+help ::
+	@echo "Usage: $(MAKE) [options] [target] ..."
+	@echo
+	@echo '[HELP]'
+	@echo '  help           Display program help'
+	@echo '  help-verbose   Display additional targets and help'
+
+# [EOF]
diff --git a/makefiles/help/variables.mk b/makefiles/help/variables.mk
new file mode 100644
index 0000000..80171a7
--- /dev/null
+++ b/makefiles/help/variables.mk
@@ -0,0 +1,36 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+# Include variables.mk after library makefiles have been included
+
+ifdef VERBOSE
+  help :: help-variables
+else
+  help ::
+	@echo
+	@echo '[VARIABLES] - Conditional makefile behavior'
+	@echo '  see also: help-variables'
+endif
+
+help-variables:
+	@echo
+	@echo '[VARIABLES] - Conditional makefile behavior'
+	@echo '  NO_PATCHES=           Do not apply patches to the python virtualenv'
+	@echo '  NO_OTHER_REPO_DOCS=   No foreign repos, only apply target to local sources.'
+	@echo '  VERBOSE=              Display extended help'
+
+# [EOF]
diff --git a/makefiles/include.mk b/makefiles/include.mk
new file mode 100644
index 0000000..746e17d
--- /dev/null
+++ b/makefiles/include.mk
@@ -0,0 +1,43 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+# OPT_ROOT    ?= /opt/trainlab/current
+# OPT_MAKEDIR := $(OPT_ROOT)/makefiles
+# MAKEDIR     ?= $(OPT_MAKEDIR)
+
+ONF_MAKE ?= $(MAKEDIR)# [TODO] -- local and library makefiles/ needed.
+ONF_MAKE ?= $(error ONF_MAKE= is required)
+
+include $(ONF_MAKE)/consts.mk
+include $(ONF_MAKE)/help/include.mk
+
+include $(ONF_MAKE)/virtualenv.mk#        # lint-{jjb,python} depends on venv
+include $(ONF_MAKE)/lint/include.mk
+include $(ONF_MAKE)/todo.mk
+# include $(MAKEDIR)/patches/include.mk#    # Patch when python 3.10+ in use
+
+# include $(ONF_MAKE)/help/variables.mk
+include $(ONF_MAKE)/help/help-verbose.mk
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/doc8/excl.mk b/makefiles/lint/doc8/excl.mk
new file mode 100644
index 0000000..efa71da
--- /dev/null
+++ b/makefiles/lint/doc8/excl.mk
@@ -0,0 +1,48 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2022 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+
+## excl := $(wildcar */*/.git)
+lint-doc8-excl-raw += '$(venv-name)'
+lint-doc8-excl-raw += '*/$(venv-name)'
+$(if $(BUILDDIR),\
+  $(excl lint-doc8-excl-raw += '$(BUILDDIR)'))
+
+# YUCK! -- overhead
+#   o Submodule(s) use individual/variant virtualenv install paths.
+#   o Exclude special snowflakes to enable library makefile use.
+#   o All can use virtualenv.mk for consistent names and cleanup
+#   o [TODO] Ignore submodules, individual repos should check their sources.
+
+lint-doc8-excl-raw += '*/venv_cord'
+lint-doc8-excl-raw += '*/vst_venv'
+
+lint-doc8-excl-raw += './cord-tester'
+lint-doc8-excl-raw += './repos/cord-tester'
+
+lint-doc8-excl-raw += './bbsim/internal/bbsim/responders/sadis/dp.txt'
+lint-doc8-excl-raw += './repos/bbsim/internal/bbsim/responders/sadis/dp.txt'
+lint-doc8-excl-raw += './repos/voltha-helm-charts/voltha-infra/templates/NOTES.txt'
+lint-doc8-excl-raw += './voltha-helm-charts/voltha-infra/templates/NOTES.txt'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/doc8/include.mk b/makefiles/lint/doc8/include.mk
new file mode 100644
index 0000000..89a15bc
--- /dev/null
+++ b/makefiles/lint/doc8/include.mk
@@ -0,0 +1,63 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2022 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-doc8 lint-doc8-all lint-doc8-modified
+
+have-rst-files := $(if $(strip $(RST_SOURCE)),true)
+RST_SOURCE     ?= $(error RST_SOURCE= is required)
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+ifndef NO-LINT-DOC8
+  lint-doc8-mode := $(if $(have-doc8-files),modified,all)
+  lint : lint-doc8-$(lint-doc8-mode)
+endif# NO-LINT-DOC8
+
+# Consistent targets across lint makefiles
+lint-doc8-all      : lint-doc8
+lint-doc8-modified : lint-doc8
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+include $(MAKEDIR)/lint/doc8/excl.mk
+lint-doc8-excl := $(addprefix --ignore-path$(space),$(lint-doc8-excl-raw))
+
+lint-doc8-args += --max-line-length 120
+
+lint-doc8: $(venv-activate-script)
+	@echo
+	@echo '** -----------------------------------------------------------------------'
+	@echo '** doc8 *.rst syntax checking'
+	@echo '** -----------------------------------------------------------------------'
+	$(activate) && doc8 --version
+	@echo
+	$(activate) && doc8 $(lint-doc8-excl) $(lint-doc8-args) .
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-doc8             Syntax check python using the doc8 command'
+  ifdef VERBOSE
+	@echo '  lint-doc8-all         doc8 checking: exhaustive'
+	@echo '  lint-doc8-modified    doc8 checking: only modified'
+  endif
+
+# [EOF]
diff --git a/makefiles/lint/golang/include.mk b/makefiles/lint/golang/include.mk
new file mode 100644
index 0000000..5289a39
--- /dev/null
+++ b/makefiles/lint/golang/include.mk
@@ -0,0 +1,33 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-golang           Syntax check golang sources'
+	@echo '    FIX=1               In-place file update'
+
+include $(MAKEDIR)/lint/golang/sca.mk
+
+# [EOF]
diff --git a/makefiles/lint/golang/sca.mk b/makefiles/lint/golang/sca.mk
new file mode 100644
index 0000000..20af593
--- /dev/null
+++ b/makefiles/lint/golang/sca.mk
@@ -0,0 +1,114 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-golang lint-golang-sca-all lint-golang-sca-modified
+
+GOLANG_FILES ?= $(error GOLANG_FILES= is required)
+
+$(info loading)
+## -----------------------------------------------------------------------
+## Intent: Use the golang command to perform syntax checking.
+##   o If UNSTABLE=1 syntax check all sources
+##   o else only check sources modified by the developer.
+## Usage:
+##   % make lint UNSTABLE=1
+##   % make lint-golang-all
+## -----------------------------------------------------------------------
+ifndef NO-LINT-GOLANG
+  lint-golang-mode := $(if $(have-golang-files),modified,all)
+  lint : lint-golang-sca-$(lint-golang-mode)
+
+  lint-golang-all      : lint-golang-sca-all
+  lint-golang-modified : lint-golang-sca-modified
+endif# NO-LINT-GOLANG
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive golint syntax checking
+## -----------------------------------------------------------------------
+## Intent: Run goformat on files on sandbox files.
+##   1) find . -name '*.go' -print0
+##      - gather all *.go sources (-name '*.go')
+##      - pass as a list of null terminated items (-print0)
+##   2) xargs --null --max-args=[n] --no-run-if-empty gofmt -d
+##      - Iterate over the list (xargs --null)
+##      - process one item per line (--max-args=1)
+##      - display filename-to-check (--verbose)
+##      - display content when diffs are detected:
+##           gofmt -d
+##           gofmt -d -s
+## -----------------------------------------------------------------------
+lint-golang-sca-xargs := $(null)
+lint-golang-sca-xargs += --null#+           # Source paths are null terminated
+lint-golang-sca-xargs += --max-args=1#+     # Check one file at a time
+lint-golang-sca-xargs += --no-run-if-empty
+lint-golang-sca-xargs += --verbose#+        # Display source path to check
+
+## [INPLACE-EDITS] make lint-golang-sca FIX=1
+ifdef FIX
+  lint-golang-sca-args += -w
+endif
+
+gofmt-args += -d# Do not output reformatted lines
+# gofmt-args += -e# Display all errors (including spurious)
+gofmt-args += -s# Try to simplify code
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive golang syntax checking
+## -----------------------------------------------------------------------
+lint-golang-sca-all: $(venv-activate-script)
+#       $(MAKE) --no-print-directory lint-sca-install
+
+	find . -name '*.go' -print0 \
+	    | xargs $(lint-golang-sca-xargs) gofmt $(gofmt-args)
+
+## -----------------------------------------------------------------------
+## Intent: check deps for format and cleanliness
+## -----------------------------------------------------------------------
+lint-golang-sca-modified: lint-golang-all
+#	$(MAKE) --no-print-directory lint-golang-sca-install
+
+	gofmt $(gofmt-args) $(GOLANG_FILES)
+
+## -----------------------------------------------------------------------
+## Intent: Tool installation as needed
+## -----------------------------------------------------------------------
+.PHONY: lint-golang-sca-install
+lint-golang-sca-install:
+	@echo
+	@echo "** -----------------------------------------------------------------------"
+	@echo "** golang syntax checking"
+	@echo "** -----------------------------------------------------------------------"
+	@echo
+
+## -----------------------------------------------------------------------
+## Intent: Display target help
+## -----------------------------------------------------------------------
+.PHONY: help-golang-sca
+help-verbose += help-golang-sca
+help-golang-sca :
+	@echo "  % $(MAKE) lint-golang GOLANG_FILES=..."
+	@echo '  lint-golang-sca-modified  golang checking: only modified'
+	@echo '  lint-golang-sca-all       golang checking: exhaustive'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/include.mk b/makefiles/lint/include.mk
new file mode 100644
index 0000000..005a72c
--- /dev/null
+++ b/makefiles/lint/include.mk
@@ -0,0 +1,50 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+# -----------------------------------------------------------------------
+# Intent: Display help banner early before library lint help targets.
+# -----------------------------------------------------------------------
+help::
+	@echo
+	@echo "[LINT]"
+
+## Disable python linting in bulk ?
+ifdef NO-LINT-PYTHON
+  NO-LINT-FLAKE8 := true
+  NO-LINT-PYLINT := true
+endif
+
+# Define early else complaints from makefiles/lint/*/include.mk
+have-golang-files := $(if $(strip $(GOLANG_FILES)),true)
+have-python-files := $(if $(strip $(PYTHON_FILES)),true)
+
+##--------------------##
+##---]  INCLUDES  [---##
+##--------------------##
+include $(MAKEDIR)/lint/doc8/include.mk
+include $(MAKEDIR)/lint/golang/include.mk
+include $(MAKEDIR)/lint/json.mk
+include $(MAKEDIR)/lint/python/include.mk
+include $(MAKEDIR)/lint/robot.mk
+include $(MAKEDIR)/lint/shell.mk
+include $(MAKEDIR)/lint/yaml.mk
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/json.mk b/makefiles/lint/json.mk
new file mode 100644
index 0000000..fb9565e
--- /dev/null
+++ b/makefiles/lint/json.mk
@@ -0,0 +1,95 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License")
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-json lint-json-all lint-json-modified
+
+have-json-files := $(if $(strip $(JSON_FILES)),true)
+JSON_FILES      ?= $(error JSON_FILES= required)
+
+## -----------------------------------------------------------------------
+## Intent: Use the json command to perform syntax checking.
+##   o If UNSTABLE=1 syntax check all sources
+##   o else only check sources modified by the developer.
+## Usage:
+##   % make lint UNSTABLE=1
+##   % make lint-json-all
+## -----------------------------------------------------------------------
+ifndef NO-LINT-JSON
+  lint-json-mode := $(if $(have-json-files),modified,all)
+  lint : lint-json-$(lint-json-mode)
+endif# NO-LINT-JSON
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive json syntax checking
+## -----------------------------------------------------------------------
+json-find-args := $(null)
+json-find-args += -name '$(venv-name)'
+lint-json-all:	
+	$(HIDE)$(MAKE) --no-print-directory lint-json-install
+
+	$(activate)\
+ && find . \( $(json-find-args) \) -prune -o -name '*.json' -print0 \
+	| $(xargs-n1) python -m json.tool > /dev/null ;\
+
+## -----------------------------------------------------------------------
+## Intent: check deps for format and python3 cleanliness
+## Note:
+##   json --py3k option no longer supported
+## -----------------------------------------------------------------------
+lint-json-modified: $(venv-activate-script)
+	$(HIDE)$(MAKE) --no-print-directory lint-json-install
+
+	$(activate)\
+ && for jsonfile in $(JSON_FILES); do \
+        echo "Validating json file: $$jsonfile" ;\
+        python -m json.tool $$jsonfile > /dev/null ;\
+    done
+
+## -----------------------------------------------------------------------
+## Intent:
+## -----------------------------------------------------------------------
+.PHONY: lint-json-install
+lint-json-install: $(venv-activate-script)
+	@echo
+	@echo "** -----------------------------------------------------------------------"
+	@echo "** json syntax checking"
+	@echo "** -----------------------------------------------------------------------"
+#	$(activate) && pip install --upgrade json.tool
+#       $(activate) && python -m json.tool --version (?-howto-?)
+	@echo
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-json             Syntax check python using the json command'
+
+help-verbose += help-lint-json-verbose
+help-lint-json-verbose:
+	@echo
+	@echo '  $(MAKE) lint-json JSON_FILES=...'
+	@echo '  lint-json-all             json checking: exhaustive'
+	@echo '  lint-json-modified        json checking: only modified'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/license/include.mk b/makefiles/lint/license/include.mk
new file mode 100644
index 0000000..aaf6e47
--- /dev/null
+++ b/makefiles/lint/license/include.mk
@@ -0,0 +1,88 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+# JSON_FILES ?= $(error JSON_FILES= is required)
+
+.PHONY: lint-license
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+lint : lint-license
+
+lint-license-gargs += --recursive
+
+# ignore: png, xlsx
+# will utf8 be excluded(?)
+lint-license-gargs += --binary-files=without-match
+lint-license-gargs += --files-without-match
+
+# [TODO] license checking accepts either Copy or Apache.
+# [TODO] At least Copyright should be required (both?)
+lint-license-gargs += --extended-regexp
+lint-license-gargs += -e 'Copyright[[:space:]]+[[:digit:]]{4}'
+lint-license-gargs += -e 'Apache License'
+
+# [TODO] --strict, --strict-dates
+
+# Editor temp files
+lint-license-gargs += --exclude='*.~'
+lint-license-gargs += --exclude='*.swp'
+
+lint-license-gargs += --exclude-dir='.git'
+
+# TODO: Normalize into .venv for consistent filtering across projects.
+lint-license-gargs += --exclude-dir='vst_venv'
+lint-license-gargs += --exclude-dir='flog'
+
+lint-license-gargs += --exclude='*.json'
+lint-license-gargs += --exclude='*.md'
+lint-license-gargs += --exclude='*.out'
+lint-license-gargs += --exclude='*.pyc'
+lint-license-gargs += --exclude='*.xml'
+
+# [FILE(s)]
+lint-license-gargs += --exclude='VERSION'
+
+# [GIT]
+# lint-license-gargs += --exclude='.gitignore'
+# lint-license-gargs += --exclude='.gitreview'
+lint-license-gargs += --exclude='\.*'
+
+# [PYTHON]
+lint-license-gargs += --exclude='requirements.txt'
+
+# [WIP]
+lint-license-gargs += --exclude='patch'
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+lint-license-new:
+	grep $(lint-license-gargs) $(dot)
+
+## -----------------------------------------------------------------------
+## Jenkins job checking logic.
+## -----------------------------------------------------------------------
+lint-license:
+	$(MAKEDIR)/lint/license/license-check.sh
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+help ::
+	@echo "  lint-license         Verify sources contain a license block."
+	@echo "  lint-license-new     Grep driven replacement logic."
+
+# [EOF]
diff --git a/makefiles/lint/license/license-check.sh b/makefiles/lint/license/license-check.sh
new file mode 100755
index 0000000..10d3376
--- /dev/null
+++ b/makefiles/lint/license/license-check.sh
@@ -0,0 +1,159 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------
+# Copyright 2022 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+# licensecheck.sh
+# checks for copyright/license headers on files
+# excludes filename extensions where this check isn't pertinent
+
+# --strict
+# --strict-dates
+#    see https://github...
+
+## ---------------------------------------------------------------------------
+## find: warning: ‘-name’ matches against basenames only, but the given pattern
+## contains a directory separator (‘/’), thus the expression will evaluate to
+## false all the time.  Did you mean ‘-wholename’?
+##
+## [TODO] find and fix plugin script, change --name to --path:
+##    find ! -name "*/docs/*" 
+## ---------------------------------------------------------------------------
+## [TODO] see license/include.mk, grep -L will ignore binaries so no need to
+## explicitly filter images, spreadsheets, etc.  Files containing utf-8 are
+## the only question mark.
+## ---------------------------------------------------------------------------
+
+set +e -u -o pipefail
+fail_licensecheck=0
+
+declare -a gargs=()
+gargs+=('--extended-regexp')
+
+# Evil regex -- scripts detecting pattern are excluded from checking.
+gargs+=('-e' 'Apache License')
+
+# Good regex -- no false positives.
+gargs+=('-e' 'Copyright[[:space:]]+[[:digit:]]{4}')
+
+while IFS= read -r -d '' path
+do
+    if ! grep -q "${gargs[@]}" "${path}";
+    then
+	echo "ERROR: $path does not contain License Header"
+	fail_licensecheck=1
+    fi
+done < <(find . -name ".git" -prune -o -type f \
+  ! -iname "*.png" \
+  ! -name "*.asc" \
+  ! -name "*.bat" \
+  ! -name "*.bin" \
+  ! -name "*.cert" \
+  ! -name "*.cfg" \
+  ! -name "*.cnf" \
+  ! -name "*.conf" \
+  ! -name "*.cql" \
+  ! -name "*.crt" \
+  ! -name "*.csar" \
+  ! -name "*.csr" \
+  ! -name "*.csv" \
+  ! -name "*.ctmpl" \
+  ! -name "*.curl" \
+  ! -name "*.db" \
+  ! -name "*.der" \
+  ! -name "*.desc" \
+  ! -name "*.diff" \
+  ! -name "*.dnsmasq" \
+  ! -name "*.do" \
+  ! -name "*.docx" \
+  ! -name "*.eot" \
+  ! -name "*.gif" \
+  ! -name "*.gpg" \
+  ! -name "*.graffle" \
+  ! -name "*.ico" \
+  ! -name "*.iml" \
+  ! -name "*.in" \
+  ! -name "*.inc" \
+  ! -name "*.install" \
+  ! -name "*.j2" \
+  ! -name "*.jar" \
+  ! -name "*.jks" \
+  ! -name "*.jpg" \
+  ! -name "*.json" \
+  ! -name "*.jsonld" \
+  ! -name "*.JSON" \
+  ! -name "*.key" \
+  ! -name "*.list" \
+  ! -name "*.local" \
+  ! -path "*.lock" \
+  ! -name "*.log" \
+  ! -name "*.mak" \
+  ! -name "*.md" \
+  ! -name "*.MF" \
+  ! -name "*.oar" \
+  ! -name "*.p12" \
+  ! -name "*.patch" \
+  ! -name "*.pb.go" \
+  ! -name "*.pb.gw.go" \
+  ! -name "*.pdf" \
+  ! -name "*.pcap" \
+  ! -name "*.pem" \
+  ! -name "*.properties" \
+  ! -name "*.proto" \
+  ! -name "*.protoset" \
+  ! -name "*.pyc" \
+  ! -name "*.repo" \
+  ! -name "*.robot" \
+  ! -name "*.rst" \
+  ! -name "*.rules" \
+  ! -name "*.service" \
+  ! -name "*.svg" \
+  ! -name "*.swp" \
+  ! -name "*.tar" \
+  ! -name "*.tar.gz" \
+  ! -name "*.toml" \
+  ! -name "*.ttf" \
+  ! -name "*.txt" \
+  ! -name "*.woff" \
+  ! -name "*.xproto" \
+  ! -name "*.xtarget" \
+  ! -name "*ignore" \
+  ! -name "*rc" \
+  ! -name "*_pb2.py" \
+  ! -name "*_pb2_grpc.py" \
+  ! -name "Dockerfile" \
+  ! -name "Dockerfile.*" \
+  ! -name "go.mod" \
+  ! -name "go.sum" \
+  ! -name "README" \
+  ! -path "*/vendor/*" \
+  ! -path "*conf*" \
+  ! -path "*git*" \
+  ! -path "*swagger*" \
+  ! -path "*.drawio" \
+  ! -name "*.pb.h" \
+  ! -name "*.pb.cc" \
+  ! -path "*/docs/*" \
+  ! -name 'output.xml' \
+  ! -path "*/vst_venv/*" \
+  ! -name '*#*' \
+  ! -path '*scripts/flog/*' \
+  ! -name '*~' \
+  ! -name 'VERSION' \
+  ! -name 'patch' \
+  -print0 )
+
+exit ${fail_licensecheck}
diff --git a/makefiles/lint/license/license-helper.sh b/makefiles/lint/license/license-helper.sh
new file mode 100755
index 0000000..499f854
--- /dev/null
+++ b/makefiles/lint/license/license-helper.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+# -----------------------------------------------------------------------
+# Copyright 2022 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+declare -i status=$#
+
+while [ $# -gt 0 ]; do
+    arg="$1"; shift
+    echo "ERROR: Detected missing license header: ${arg}"
+done
+
+if [ $status -ne 0 ]; then
+    exit 1
+fi
+
+/bin/true # set $?
+
+# [EOF]
diff --git a/makefiles/lint/python.mk b/makefiles/lint/python.mk
new file mode 100644
index 0000000..86503a7
--- /dev/null
+++ b/makefiles/lint/python.mk
@@ -0,0 +1,33 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2022 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+PYTHON_FILES ?= $(error PYTHON_FILES= is required)
+
+.PHONY: lint-python
+
+lint : lint-python
+
+lint-python: vst_venv
+	-source ./$</bin/activate \
+	    && set -u \
+	    && pylint $(PYTHON_FILES) \
+	    && flake8 --max-line-length=99 --count $(PYTHON_FILES)
+
+help::
+	@echo "  lint-python          Syntax check using pylint and flake8"
+
+# [EOF]
diff --git a/makefiles/lint/python/flake8.mk b/makefiles/lint/python/flake8.mk
new file mode 100644
index 0000000..45c01e3
--- /dev/null
+++ b/makefiles/lint/python/flake8.mk
@@ -0,0 +1,87 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License")
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-flake8 lint-flake8-all lint-flake8-modified
+
+PYTHON_FILES      ?= $(error PYTHON_FILES= required)
+
+## -----------------------------------------------------------------------
+## Intent: Use the flake8 command to perform syntax checking.
+## Usage:
+##   % make lint
+##   % make lint-flake8-all
+## -----------------------------------------------------------------------
+ifndef NO-LINT-FLAKE8
+  lint-flake8-mode := $(if $(have-python-files),modified,all)
+  lint : lint-flake8-$(lint-flake8-mode)
+endif# NO-LINT-FLAKE8
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive flake8 syntax checking
+## -----------------------------------------------------------------------
+lint-flake8-all: $(venv-activate-script)
+	$(HIDE)$(MAKE) --no-print-directory lint-flake8-install
+
+	$(activate)\
+ && find . \( -name '$(venv-name)' \) -prune -o -name '*.py' -print0 \
+	| $(xargs-n1) flake8 --max-line-length=99 --count
+
+## -----------------------------------------------------------------------
+## Intent: check deps for format and python3 cleanliness
+## Note:
+##   pylint --py3k option no longer supported
+## -----------------------------------------------------------------------
+lint-flake8-modified: $(venv-activate-script)
+	$(HIDE)$(MAKE) --no-print-directory lint-flake8-install
+
+	$(activate)\
+ && flake8 --max-line-length=99 --count $(PYTHON_FILES)
+
+## -----------------------------------------------------------------------
+## Intent:
+## -----------------------------------------------------------------------
+.PHONY: lint-flake8-install
+lint-flake8-install: $(venv-activate-script)
+	@echo
+	@echo "** -----------------------------------------------------------------------"
+	@echo "** python flake8 syntax checking"
+	@echo "** -----------------------------------------------------------------------"
+	$(activate) && pip install --upgrade flake8
+	$(activate) && flake8 --version
+	@echo
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-flake8           Syntax check python using the flake8 command'
+
+help-verbose += help-lint-python-verbose
+help-lint-python-verbose:
+	@echo	
+	@echo '  $(MAKE) lint-flake8 PYTHON_FILES=...'
+	@echo '  lint-flake8-modified  flake8 checking: only modified'
+	@echo '  lint-flake8-all       flake8 checking: exhaustive'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/python/include.mk b/makefiles/lint/python/include.mk
new file mode 100644
index 0000000..69811a5
--- /dev/null
+++ b/makefiles/lint/python/include.mk
@@ -0,0 +1,27 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+$(if $(UNSTABLE),$(eval lint-python-all := true))
+
+include $(MAKEDIR)/lint/python/flake8.mk
+include $(MAKEDIR)/lint/python/pylint.mk
+# include $(MAKEDIR)/lint/python/tox.mk
+
+# [EOF]
diff --git a/makefiles/lint/python/pylint.mk b/makefiles/lint/python/pylint.mk
new file mode 100644
index 0000000..98d48ed
--- /dev/null
+++ b/makefiles/lint/python/pylint.mk
@@ -0,0 +1,91 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License")
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-pylint lint-pylint-all lint-pylint-modified
+
+PYTHON_FILES      ?= $(error PYTHON_FILES= required)
+
+## -----------------------------------------------------------------------
+## Intent: Use the pylint command to perform syntax checking.
+##   o If UNSTABLE=1 syntax check all sources
+##   o else only check sources modified by the developer.
+## Usage:
+##   % make lint UNSTABLE=1
+##   % make lint-pylint-all
+## -----------------------------------------------------------------------
+ifndef NO-LINT-PYLINT
+  lint-pylint-mode := $(if $(have-python-files),modified,all)
+  lint : lint-pylint-$(lint-pylint-mode)
+endif# NO-LINT-PYLINT
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive pylint syntax checking
+## -----------------------------------------------------------------------
+pylint-find-args := $(null)
+pylint-find-args += -name '$(venv-name)'
+pylint-find-args += -o -name 'patches'
+lint-pylint-all: $(venv-activate-script)
+	$(MAKE) --no-print-directory lint-pylint-install
+
+	$(activate)\
+ && find . \( $(pylint-find-args) \) -prune -o -name '*.py' -print0 \
+	| $(xargs-n1) pylint
+
+## -----------------------------------------------------------------------
+## Intent: check deps for format and python3 cleanliness
+## Note:
+##   pylint --py3k option no longer supported
+## -----------------------------------------------------------------------
+lint-pylint-modified: $(venv-activate-script)
+	$(MAKE) --no-print-directory lint-pylint-install
+
+	$(activate) && pylint $(PYTHON_FILES)
+
+## -----------------------------------------------------------------------
+## Intent:
+## -----------------------------------------------------------------------
+.PHONY: lint-pylint-install
+lint-pylint-install: $(venv-activate-script)
+	@echo
+	@echo "** -----------------------------------------------------------------------"
+	@echo "** python pylint syntax checking"
+	@echo "** -----------------------------------------------------------------------"
+	$(activate) && pip install --upgrade pylint
+	$(activate) && pylint --version
+	@echo
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-pylint           Syntax check python using the pylint command'
+
+help-verbose += help-lint-pylint-verbose
+help-lint-pylint-verbose:
+	@echo
+	@echo '  $(MAKE) lint-pylint PYTHON_FILES=...'
+	@echo '  lint-pylint-modified  pylint checking: only modified'
+	@echo '  lint-pylint-all       pylint checking: exhaustive'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/robot.mk b/makefiles/lint/robot.mk
new file mode 100644
index 0000000..9ba28b0
--- /dev/null
+++ b/makefiles/lint/robot.mk
@@ -0,0 +1,96 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License")
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-robot lint-robot-all lint-robot-modified
+
+have-robot-files := $(if $(ROBOT_FILES),true)
+ROBOT_FILES      ?= $(error ROBOT_FILES= required)
+
+LINT_ARGS ?= --verbose --configure LineTooLong:130 -e LineTooLong \
+             --configure TooManyTestSteps:65 -e TooManyTestSteps \
+             --configure TooManyTestCases:50 -e TooManyTestCases \
+             --configure TooFewTestSteps:1 \
+             --configure TooFewKeywordSteps:1 \
+             --configure FileTooLong:2000 -e FileTooLong \
+             -e TrailingWhitespace
+
+## -----------------------------------------------------------------------
+## Intent: Use the robot command to perform syntax checking.
+##   % make lint
+##   % make lint-robot-all
+##   % make lint-robot-modified
+## -----------------------------------------------------------------------
+ifndef NO-LINT-ROBOT
+  lint-robot-mode := $(if $(have-robot-files),modified,all)
+  lint : lint-robot-$(lint-robot-mode)
+endif# NO-LINT-ROBOT
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive robot syntax checking
+## -----------------------------------------------------------------------
+lint-robot-all:
+	$(HIDE)$(MAKE) --no-print-directory rflint-install
+
+	$(activate)\
+ && find . \( -iname '*.robot' \) -print0 \
+	| $(xargs-n1) rflint $(LINT_ARGS)
+
+## -----------------------------------------------------------------------
+## Intent: check deps for format and python3 cleanliness
+## Note:
+##   robot --py3k option no longer supported
+## -----------------------------------------------------------------------
+lint-robot-modified: $(venv-activate-script)
+	$(HIDE)$(MAKE) --no-print-directory rflint-install
+
+	$(activate) && rflint $(LINT_ARGS) $(ROBOT_FILES)
+
+## -----------------------------------------------------------------------
+## Intent: Install the rflint command for syntax checking.
+##   Note: requirements.txt pip install not used here ATM due to implicit
+##         per-repository dependency config to enable checking.
+## -----------------------------------------------------------------------
+rflint-install: $(venv-activate-script)
+	@echo
+	@echo "** -----------------------------------------------------------------------"
+	@echo "** robot syntax checking"
+	@echo "** -----------------------------------------------------------------------"
+	$(activate)\
+ && pip install --upgrade robotframework-lint
+	$(activate) && rflint --version
+	@echo
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-robot            Syntax check python using the robot command'
+
+help-verbose += help-lint-robot-verbose
+help-lint-robot-verbose:
+	@echo '  $(MAKE) lint-robot ROBOT_FILES=...'
+	@echo '  lint-robot-all        robot checking: exhaustive'
+	@echo '  lint-robot-modified   robot checking: only modified'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/shell.mk b/makefiles/lint/shell.mk
new file mode 100644
index 0000000..86e91c3
--- /dev/null
+++ b/makefiles/lint/shell.mk
@@ -0,0 +1,89 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License")
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-shell lint-shell-all lint-shell-modified
+
+have-shell-sources := $(if $(strip $(SHELL_SOURCES)),true)
+SHELL_SOURCES      ?= $(error SHELL_SOURCES= required)
+
+## -----------------------------------------------------------------------
+## Intent: Use the shell command to perform syntax checking.
+##   % make lint
+##   % make lint-shell-all
+## -----------------------------------------------------------------------
+ifndef NO-LINT-SHELL
+  lint-shell-mode := $(if $(have-shell-sources),modified,all)
+  lint : lint-shell-$(lint-shell-mode)
+endif# NO-LINT-SHELL
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive shell syntax checking
+## -----------------------------------------------------------------------
+shellcheck-find-args := $(null)
+shellcheck-find-args += -name '$(venv-name)'
+shellcheck-find-args += -o -name 'staging'
+lint-shell-all:
+	$(MAKE) --no-print-directory lint-shellcheck-install
+
+	find . \( $(shellcheck-find-args) \) -prune -name '*.sh' -print0 \
+	    | $(xargs-n1-clean) shellcheck
+
+## -----------------------------------------------------------------------
+## Intent: check deps for format and python3 cleanliness
+## Note:
+##   shell --py3k option no longer supported
+## -----------------------------------------------------------------------
+lint-shell-modified:
+	$(MAKE) --no-print-directory lint-shell-install
+
+	shellcheck $(SHELL_SOURCES)
+
+## -----------------------------------------------------------------------
+## Intent:
+## -----------------------------------------------------------------------
+.PHONY: lint-shellcheck-install
+lint-shellcheck-install:
+	@echo
+	@echo "** -----------------------------------------------------------------------"
+	@echo '** command shell syntax checking'
+	@echo "** -----------------------------------------------------------------------"
+
+        # {apt-get,rpm,yum} install shellcheck
+	shellcheck --version
+	@echo
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-shell            Syntax check sources using shellcheck'
+
+help-verbose += help-shell-verbose
+help-shell-verbose:
+	@echo
+	@echo '  $(MAKE) lint-shell SHELL_SOURCES=...'
+	@echo '  lint-shell-modified  shell checking: only modified'
+	@echo '  lint-shell-all       shell checking: exhaustive'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/yaml.mk b/makefiles/lint/yaml.mk
new file mode 100644
index 0000000..f9d3382
--- /dev/null
+++ b/makefiles/lint/yaml.mk
@@ -0,0 +1,84 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License")
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-yaml lint-yaml-all lint-yaml-modified
+
+have-yaml-files := $(if $(strip $(YAML_FILES)),true)
+YAML_FILES      ?= $(error YAML_FILES= is required)
+
+## -----------------------------------------------------------------------
+## Intent: Use the yaml command to perform syntax checking.
+##   o If UNSTABLE=1 syntax check all sources
+##   o else only check sources modified by the developer.
+## Usage:
+##   % make lint UNSTABLE=1
+##   % make lint-yaml-all
+## -----------------------------------------------------------------------
+ifndef NO-LINT-YAML
+  lint-yaml-mode := $(if $(have-yaml-files),modified,all)
+  lint : lint-yaml-$(lint-yaml-mode)
+endif# NO-LINT-YAML
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive yaml syntax checking
+## -----------------------------------------------------------------------
+lint-yaml-all:
+	$(HIDE)$(MAKE) --no-print-directory lint-yaml-install
+
+	find . \( -iname '*.yaml' -o -iname '*.yml' \) -print0 \
+	    | $(xargs-n1-clean) yamllint --strict
+
+## -----------------------------------------------------------------------
+## Intent: check deps for format and python3 cleanliness
+## Note:
+##   yaml --py3k option no longer supported
+## -----------------------------------------------------------------------
+lint-yaml-modified:
+	$(HIDE)$(MAKE) --no-print-directory lint-yaml-install
+	yamllint -s $(YAML_FILES)
+
+## -----------------------------------------------------------------------
+## Intent:
+## -----------------------------------------------------------------------
+lint-yaml-install:
+	@echo
+	@echo "** -----------------------------------------------------------------------"
+	@echo "** yaml syntax checking"
+	@echo "** -----------------------------------------------------------------------"
+	yamllint --version
+	@echo
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-yaml             Syntax check python using the yaml command'
+
+help-verbose += help-lint-yaml-verbose
+help-lint-yaml-verbose:
+	@echo '  $(MAKE) lint-yaml YAML_FILES=...'
+	@echo '  lint-yaml-all         yaml checking: exhaustive'
+	@echo '  lint-yaml-modified    yaml checking: only modified'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/targets/clean.mk b/makefiles/targets/clean.mk
new file mode 100644
index 0000000..bf29699
--- /dev/null
+++ b/makefiles/targets/clean.mk
@@ -0,0 +1,31 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+help ::
+	@echo
+	@echo '[CLEAN]'
+	@echo '  clean          Remove generated targets'
+	@echo '  sterile        clean + remove virtual env interpreter install'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/targets/tox.mk b/makefiles/targets/tox.mk
new file mode 100644
index 0000000..5942774
--- /dev/null
+++ b/makefiles/targets/tox.mk
@@ -0,0 +1,41 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+## -----------------------------------------------------------------------
+## Intent: Sanity check incoming JJB config changes.
+##   Todo: Depend on makefiles/lint/jjb.mk :: lint-jjb
+## -----------------------------------------------------------------------
+# lint : lint-jjb
+lint-tox: lint-jjb
+	tox -e py310 --workers=auto
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+help-verbose += help-tox
+help-tox ::
+	@echo
+	@echo '[MAKE: tox]'
+	@echo '  lint-tox            Python unit testing, sanity check incoming JJB changes.'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/todo.mk b/makefiles/todo.mk
new file mode 100644
index 0000000..e899bff
--- /dev/null
+++ b/makefiles/todo.mk
@@ -0,0 +1,37 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+todo ::
+	@echo '[TODO]'
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+help ::
+	@echo
+	@echo '[TODO]'
+	@echo '  todo                  Display future enhancement list.'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/virtualenv.mk b/makefiles/virtualenv.mk
new file mode 100644
index 0000000..bcda734
--- /dev/null
+++ b/makefiles/virtualenv.mk
@@ -0,0 +1,87 @@
+# -*- makefile -*-
+## -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+## -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: venv
+
+##------------------##
+##---]  LOCALS  [---##
+##------------------##
+venv-name            ?= .venv#                            # default install directory
+venv-abs-path        := $(PWD)/$(venv-name)
+
+venv-activate-script := $(venv-name)/bin/activate#        # dependency
+
+# Intent: activate= is a macro for accessing the virtualenv activation script#
+#  Usage: $(activate) && python
+activate             ?= set +u && source $(venv-activate-script) && set -u
+
+## -----------------------------------------------------------------------
+## Intent: Activate script path dependency
+## Usage:
+##    o place on the right side of colon as a target dependency
+##    o When the script does not exist install the virtual env and display.
+## -----------------------------------------------------------------------
+$(venv-activate-script):
+	@echo
+	@echo "============================="
+	@echo "Installing python virtual env"
+	@echo "============================="
+	virtualenv -p python3 $(venv-name)
+	$(activate) && python -m pip install --upgrade pip
+	$(activate) && pip install --upgrade setuptools
+	$(activate) && { [[ -r requirements.txt ]] && python -m pip install -r requirements.txt; }
+	$(activate) && python --version
+
+ifndef NO_PYTHON_UPGRADE_PATCHING
+	@echo
+	@echo '** -----------------------------------------------------------------------'
+	@echo '** Applying python virtualenv patches as needed (v3.10+)'
+	@echo '** -----------------------------------------------------------------------'
+	./patches/python_310_migration.sh '--venv' '$(venv-name)' 'apply'
+endif
+
+## -----------------------------------------------------------------------
+## Intent: Explicit named installer target w/o dependencies.
+##         Makefile targets should depend on venv-activate-script.
+## -----------------------------------------------------------------------
+venv: $(venv-activate-script)
+
+## -----------------------------------------------------------------------
+## Intent: Revert installation to a clean checkout
+## -----------------------------------------------------------------------
+sterile :: clean
+	$(RM) -r "$(venv-abs-path)"
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+help ::
+	@echo
+	@echo '[VIRTUAL ENV]'
+	@echo '  venv                Create a python virtual environment'
+	@echo '    venv-name=        Subdir name for virtualenv install'
+	@echo '  venv-activate-script         make macro name'
+	@echo '      $$(target) dependency    install python virtualenv'
+	@echo '      source $$(macro) && cmd  configure env and run cmd'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]