diff --git a/Makefile b/Makefile
index 9a9b47d..ba42fef 100644
--- a/Makefile
+++ b/Makefile
@@ -1,122 +1,6 @@
-MAKEFILE_PATH                   := $(abspath $(lastword $(MAKEFILE_LIST)))
-ROOT_DIR                        := $(patsubst %/,%,$(dir $(MAKEFILE_PATH)))
-
-SRC_DIR                         := $(ROOT_DIR)/src
-TESTS_DIR                       := $(ROOT_DIR)/tests
-VENDOR_DIR                      := $(ROOT_DIR)/vendor
-
+PROJECT_ROOT                    ?= gnmi/proto
 PROTO_PACKAGE                   ?= github.com/openconfig/gnmi/proto
-PROTO_PATH                      := $(VENDOR_DIR)/$(PROTO_PACKAGE)
-
-PACKAGE_BETTERPROTO             ?= gnmi/proto/_internal
-PACKAGE_BETTERPROTO_PATH        := $(SRC_DIR)/$(PACKAGE_BETTERPROTO)
-
-PACKAGE_LEGACY                  ?= gnmi/proto/_legacy
-PACKAGE_LEGACY_PATH             := $(SRC_DIR)/$(PACKAGE_LEGACY)
-
-define USAGE
-
-This makefile provides a sugar-coated interface for automation of
-development environment tasks/chores and also provides a easy-to-use
-interface for ci-jobs.
-
-	Usage: make <target>
-
-If you would like see target specific help (where available) use
-	$ make <target>/help
-
-endef
-export USAGE
-
-.PHONY:all
-all:
-	@echo "$$USAGE"
-
-define command_check
-	@type $(1) > /dev/null 2>&1 || {\
-		echo 1>&2 "$(1) command not found in \$$PATH"; exit 1;\
-	}
-endef
-
-# custom wrapper to generate python source from gnmi proto files using default python
-define protoc-legacy
-	@echo "Regenerating legacy python code for $(1) ..."
-	@{\
-		install -d $(PACKAGE_LEGACY_PATH);\
-		proto=$(1);\
-		src="$(PROTO_PATH)/$${proto}/$${proto}.proto";\
-		dst="$(PACKAGE_LEGACY_PATH)/$${proto}/$${proto}.proto";\
-		install -D $${src} $${dst};\
-		touch $$(dirname $${dst}/__init__.py);\
-		sed -i s+'^option go_package = "$(PROTO_PACKAGE)'+'option go_package = "$(PACKAGE_LEGACY)'+g $${dst};\
-		sed -i s+'^import "$(PROTO_PACKAGE)'+'import "$(PACKAGE_LEGACY)'+g $${dst};\
-		poetry run python -m grpc.tools.protoc \
-			--proto_path="$(SRC_DIR)/" \
-			--python_out=$(SRC_DIR)/ \
-			--grpc_python_out=$(SRC_DIR)/ $${dst};\
-	}
-endef
-
-.PHONY: %/help
-%/help: HELP_TARGET = $(subst /help,,$@)
-%/help:
-	@make -C $(ROOT_DIR) help | grep -Pzo "\n$(HELP_TARGET)(/\w+)*:.*(\n\s+(.*)?)*\n" \
-		|| echo >&2 "No help found. You are on your own. All alone. In this big bad world."
-
-### help:
-##### displays this help message.
-.PHONY: help
-help: | all
-	@grep -P '^\s*###* ' $(MAKEFILE_LIST) | sed s/'\s*### '// | sed s/'#'/'    '/g
-
-### debug/show/vars:
-##### debug target to list all variables and their values.
-.PHONY: debug/show/vars
-debug/show/vars:
-	@echo "===================================================================="
-	@echo "MAKEFILE_PATH                   = $(MAKEFILE_PATH)"
-	@echo "ROOT_DIR                        = $(ROOT_DIR)"
-	@echo "TESTS_DIR                       = $(TESTS_DIR)"
-	@echo "SHELL                           = $(SHELL)"
-	@echo "===================================================================="
-
-### check/commands:
-##### Checks if all required commands are available.
-.PHONY: check/commands
-check/commands:
-	$(call command_check,poetry)
-	$(call command_check,git)
-
-### update/vendor
-##### updated vendored source
-.PHONY: update/vendor
-update/vendor: | check/commands
-	@echo "Updating git submodules ..."
-	@git submodule update --init --recursive
-
-### update/proto/legacy
-##### regenerate legacy source from proto files
-.PHONY: update/proto/legacy
-update/proto/legacy:
-	$(call protoc-legacy,gnmi_ext)
-	$(call protoc-legacy,gnmi)
-	$(call protoc-legacy,collector)
-	$(call protoc-legacy,target)
-
-### update/proto
-##### regenerate source from proto files
-.PHONY: update/proto
-update/proto:
-	@echo "Regenerating betterproto source ..."
-	@poetry run python -m grpc.tools.protoc --proto_path="$(VENDOR_DIR):$(ROOT_DIR)" \
-		--python_betterproto_out=$(PACKAGE_BETTERPROTO_PATH) \
-		$(PROTO_PATH)/gnmi/gnmi.proto \
-		$(PROTO_PATH)/gnmi_ext/gnmi_ext.proto \
-		$(PROTO_PATH)/collector/collector.proto \
-		$(PROTO_PATH)/target/target.proto
+PROTOS                          ?= gnmi_ext/gnmi_ext gnmi/gnmi collector/collector \
+                                   target/target
 
-### update
-##### update vendored source and regenerate python source
-.PHONY: update
-update: | update/vendor update/proto update/proto/legacy
-	@echo "Update completed successfully"
+include Makefile.in
diff --git a/Makefile.in b/Makefile.in
new file mode 100644
index 0000000..dcc7ea9
--- /dev/null
+++ b/Makefile.in
@@ -0,0 +1,126 @@
+MAKEFILE_PATH                   := $(abspath $(firstword $(MAKEFILE_LIST)))
+ROOT_DIR                        := $(patsubst %/,%,$(dir $(MAKEFILE_PATH)))
+
+SRC_DIR                         := $(ROOT_DIR)/src
+TESTS_DIR                       := $(ROOT_DIR)/tests
+VENDOR_DIR                      := $(ROOT_DIR)/vendor
+
+PROTO_PATH                      := $(VENDOR_DIR)/$(PROTO_PACKAGE)
+PROTO_FILES                     := $(foreach var,$(PROTOS),$(PROTO_PATH)/$(var).proto)
+
+PACKAGE_BETTERPROTO             := $(PROJECT_ROOT)/_internal
+PACKAGE_BETTERPROTO_PATH        := $(SRC_DIR)/$(PACKAGE_BETTERPROTO)
+
+PACKAGE_LEGACY                  := $(PROJECT_ROOT)/_legacy
+PACKAGE_LEGACY_PATH             := $(SRC_DIR)/$(PACKAGE_LEGACY)
+
+define USAGE
+
+This makefile provides a sugar-coated interface for automation of
+development environment tasks/chores and also provides a easy-to-use
+interface for ci-jobs.
+
+	Usage: make <target>
+
+If you would like see target specific help (where available) use
+	$ make <target>/help
+
+endef
+export USAGE
+
+.PHONY:all
+all:
+	@echo "$$USAGE"
+
+define command_check
+	@type $(1) > /dev/null 2>&1 || {\
+		echo 1>&2 "$(1) command not found in \$$PATH"; exit 1;\
+	}
+endef
+
+# custom wrapper to generate python source from gnmi proto files using default python
+define protoc-legacy
+	@echo "Regenerating legacy python code for $(1) ..."
+	@{\
+		install -d $(PACKAGE_LEGACY_PATH);\
+		proto=$(1);\
+		src="$(PROTO_PATH)/$${proto}.proto";\
+		dst="$(PACKAGE_LEGACY_PATH)/$${proto}.proto";\
+		install -D $${src} $${dst};\
+		touch $$(dirname $${dst}/__init__.py);\
+		sed -i s+'^option go_package = "$(PROTO_PACKAGE)'+'option go_package = "$(PACKAGE_LEGACY)'+g $${dst};\
+		sed -i s+'^import "$(PROTO_PACKAGE)'+'import "$(PACKAGE_LEGACY)'+g $${dst};\
+		poetry run python -m grpc.tools.protoc \
+			--proto_path="$(SRC_DIR)/" \
+			--python_out=$(SRC_DIR)/ \
+			--grpc_python_out=$(SRC_DIR)/ $${dst};\
+	}
+endef
+
+.PHONY: %/help
+%/help: HELP_TARGET = $(subst /help,,$@)
+%/help:
+	@make -C $(ROOT_DIR) help | grep -Pzo "\n$(HELP_TARGET)(/\w+)*:.*(\n\s+(.*)?)*\n" \
+		|| echo >&2 "No help found. You are on your own. All alone. In this big bad world."
+
+### help:
+##### displays this help message.
+.PHONY: help
+help: | all
+	@grep -P '^\s*###* ' $(MAKEFILE_LIST) | sed s/'\s*### '// | sed s/'#'/'    '/g
+
+### debug/show/vars:
+##### debug target to list all variables and their values.
+.PHONY: debug/show/vars
+debug/show/vars:
+	@echo "===================================================================="
+	@echo "MAKEFILE_PATH                   = $(MAKEFILE_PATH)"
+	@echo "ROOT_DIR                        = $(ROOT_DIR)"
+	@echo "SRC_DIR                         = $(TESTS_DIR)"
+	@echo "TESTS_DIR                       = $(TESTS_DIR)"
+	@echo "VENDOR_DIR                      = $(VENDOR_DIR)"
+	@echo "PROJECT_ROOT                    = $(PROJECT_ROOT)"
+	@echo "PROTO_PACKAGE                   = $(PROTO_PACKAGE)"
+	@echo "PROTOS                          = $(PROTOS)"
+	@echo "PACKAGE_BETTERPROTO_PATH        = $(PACKAGE_BETTERPROTO_PATH)"
+	@echo "PACKAGE_LEGACY_PATH             = $(PACKAGE_LEGACY_PATH)"
+	@echo "===================================================================="
+
+### check/commands:
+##### Checks if all required commands are available.
+.PHONY: check/commands
+check/commands:
+	$(call command_check,poetry)
+	$(call command_check,git)
+
+### update/vendor
+##### updated vendored source
+.PHONY: update/vendor
+update/vendor: | check/commands
+	@echo "Updating git submodules ..."
+	@git submodule update --init --recursive
+
+.PHONY: update/proto/legacy/%
+update/proto/legacy/%:
+	$(call protoc-legacy,$*)
+
+### update/proto/legacy
+##### regenerate legacy source from proto files
+.PHONY: update/proto/legacy
+update/proto/legacy: | $(foreach var,$(PROTOS),update/proto/legacy/$(var))
+	@:
+
+### update/proto
+##### regenerate source from proto files
+.PHONY: update/proto
+update/proto:
+	@echo "Regenerating betterproto source ..."
+	@poetry run python -m grpc.tools.protoc --proto_path="$(VENDOR_DIR):$(ROOT_DIR)" \
+		--python_betterproto_out=$(PACKAGE_BETTERPROTO_PATH) \
+		$(PROTO_FILES)
+
+### update
+##### update vendored source and regenerate python source
+.PHONY: update
+update: | update/vendor update/proto update/proto/legacy
+	@echo "Update completed successfully"