diff --git a/makefiles/jjb/required.mk b/makefiles/jjb/required.mk
new file mode 100644
index 0000000..17371e9
--- /dev/null
+++ b/makefiles/jjb/required.mk
@@ -0,0 +1,33 @@
+# -*- 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.
+# -----------------------------------------------------------------------
+# Intent: Conditionally load when named targets are requested.
+#   var ?= $(error ...) definitions are fatal to "make help" and others
+# -----------------------------------------------------------------------
+
+onf-mk-jjb-targets := $(NULL)
+onf-mk-jjb-targets += jjb-gen
+onf-mk-jjb-targets += sterile
+
+# -----------------------------------------------------------------------
+# Define a flag to only load release targets when mentioned by name
+# Makefile can also explicitly define the flag to force always loading.
+# -----------------------------------------------------------------------
+$(foreach tgt,$(onf-mk-jjb-targets),\
+  $(if $(findstring $(tgt),$(MAKECMDGOALS)),$(eval USE-ONF-JJB-MK := true))\
+)
+
+# [EOF]