diff --git a/Makefile b/Makefile
index 2dfab32748..4bc42cd372 100644
--- a/Makefile
+++ b/Makefile
@@ -1,147 +1,20 @@
-###############################################################################
-## Wrapper for starting make inside sonic-slave container
-#
-#  Supported parameters:
-#
-#  * PLATFORM: Specific platform we wish to build images for.
-#  * BUILD_NUMBER: Desired version-number to pass to the building-system.
-#  * ENABLE_DHCP_GRAPH_SERVICE: Enables get-graph service to fetch minigraph files
-#    through http.
-#  * SHUTDOWN_BGP_ON_START: Sets admin-down state for all bgp peerings after restart.
-#  * ENABLE_PFCWD_ON_START: Enable PFC Watchdog (PFCWD) on server-facing ports
-#  * by default for TOR switch.
-#  * SONIC_ENABLE_SYNCD_RPC: Enables rpc-based syncd builds.
-#  * USERNAME: Desired username -- default at rules/config
-#  * PASSWORD: Desired password -- default at rules/config
-#  * KEEP_SLAVE_ON: Keeps slave container up after building-process concludes.
-#  * SOURCE_FOLDER: host path to be mount as /var/$(USER)/src, only effective when KEEP_SLAVE_ON=yes
-#  * SONIC_BUILD_JOBS: Specifying number of concurrent build job(s) to run
-#  * KERNEL_PROCURE_METHOD: Specifying method of obtaining kernel Debian package: download or build
-#
-###############################################################################
+# SONiC make file
 
-SHELL = /bin/bash
-
-USER := $(shell id -un)
-PWD := $(shell pwd)
-
-ifeq ($(USER), root)
-$(error Add your user account to docker group and use your user account to make. root or sudo are not supported!)
-endif
-
-# Remove lock file in case previous run was forcefully stopped
-$(shell rm -f .screen)
-
-MAKEFLAGS += -B
-
-ifeq ($(BLDENV), stretch)
-SLAVE_BASE_TAG = $(shell sha1sum sonic-slave-stretch/Dockerfile | awk '{print substr($$1,0,11);}')
-SLAVE_TAG = $(shell cat sonic-slave-stretch/Dockerfile.user sonic-slave-stretch/Dockerfile | sha1sum | awk '{print substr($$1,0,11);}')
-SLAVE_BASE_IMAGE = sonic-slave-stretch-base
-SLAVE_IMAGE = sonic-slave-stretch-$(USER)
-SLAVE_DIR = sonic-slave-stretch
-else
-SLAVE_BASE_TAG = $(shell sha1sum sonic-slave/Dockerfile | awk '{print substr($$1,0,11);}')
-SLAVE_TAG = $(shell cat sonic-slave/Dockerfile.user sonic-slave/Dockerfile | sha1sum | awk '{print substr($$1,0,11);}')
-SLAVE_BASE_IMAGE = sonic-slave-base
-SLAVE_IMAGE = sonic-slave-$(USER)
-SLAVE_DIR = sonic-slave
-endif
-
-INSMOD_OVERLAY := sudo modprobe overlay
-DOCKER_RUN := docker run --rm=true --privileged \
-    -v $(PWD):/sonic \
-    -w /sonic \
-    -e "http_proxy=$(http_proxy)" \
-    -e "https_proxy=$(https_proxy)" \
-    -i$(if $(TERM),t,)
-
-DOCKER_BASE_BUILD = docker build --no-cache \
-		    -t $(SLAVE_BASE_IMAGE) \
-		    --build-arg http_proxy=$(http_proxy) \
-		    --build-arg https_proxy=$(https_proxy) \
-		    $(SLAVE_DIR) && \
-		    docker tag $(SLAVE_BASE_IMAGE):latest $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG)
-
-DOCKER_BUILD = docker build --no-cache \
-	       --build-arg user=$(USER) \
-	       --build-arg uid=$(shell id -u) \
-	       --build-arg guid=$(shell id -g) \
-	       --build-arg hostname=$(shell echo $$HOSTNAME) \
-	       -t $(SLAVE_IMAGE) \
-	       -f $(SLAVE_DIR)/Dockerfile.user \
-	       $(SLAVE_DIR) && \
-	       docker tag $(SLAVE_IMAGE):latest $(SLAVE_IMAGE):$(SLAVE_TAG)
-
-SONIC_BUILD_INSTRUCTION :=  make \
-                           -f slave.mk \
-                           PLATFORM=$(PLATFORM) \
-                           BUILD_NUMBER=$(BUILD_NUMBER) \
-                           ENABLE_DHCP_GRAPH_SERVICE=$(ENABLE_DHCP_GRAPH_SERVICE) \
-                           SHUTDOWN_BGP_ON_START=$(SHUTDOWN_BGP_ON_START) \
-                           SONIC_ENABLE_PFCWD_ON_START=$(ENABLE_PFCWD_ON_START) \
-                           ENABLE_SYNCD_RPC=$(ENABLE_SYNCD_RPC) \
-                           PASSWORD=$(PASSWORD) \
-                           USERNAME=$(USERNAME) \
-                           SONIC_BUILD_JOBS=$(SONIC_BUILD_JOBS) \
-                           KERNEL_PROCURE_METHOD=$(KERNEL_PROCURE_METHOD) \
-                           HTTP_PROXY=$(http_proxy) \
-                           HTTPS_PROXY=$(https_proxy) \
-                           SONIC_ENABLE_SYSTEM_TELEMETRY=$(ENABLE_SYSTEM_TELEMETRY)
-
-.PHONY: sonic-slave-build sonic-slave-bash init reset
-
-.DEFAULT_GOAL :=  all
+NOSTRETCH ?= 0
 
 %::
-	@docker inspect --type image $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG) &> /dev/null || \
-	    { echo Image $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG) not found. Building... ; \
-	    $(DOCKER_BASE_BUILD) ; }
-	@docker inspect --type image $(SLAVE_IMAGE):$(SLAVE_TAG) &> /dev/null || \
-	    { echo Image $(SLAVE_IMAGE):$(SLAVE_TAG) not found. Building... ; \
-	    $(DOCKER_BUILD) ; }
-	@$(INSMOD_OVERLAY)
-ifeq "$(KEEP_SLAVE_ON)" "yes"
-    ifdef SOURCE_FOLDER
-		@$(DOCKER_RUN) -v $(SOURCE_FOLDER):/var/$(USER)/src $(SLAVE_IMAGE):$(SLAVE_TAG) bash -c "$(SONIC_BUILD_INSTRUCTION) $@; /bin/bash"
-    else
-		@$(DOCKER_RUN) $(SLAVE_IMAGE):$(SLAVE_TAG) bash -c "$(SONIC_BUILD_INSTRUCTION) $@; /bin/bash"
-    endif
-else
-	@$(DOCKER_RUN) $(SLAVE_IMAGE):$(SLAVE_TAG) $(SONIC_BUILD_INSTRUCTION) $@
+	@echo "+++ --- Making $@ --- +++"
+ifeq ($(NOSTRETCH), 0)
+	BLDENV=stretch make -f Makefile.work stretch
+endif
+	make -f Makefile.work $@
+
+stretch:
+	@echo "+++ Making $@ +++"
+ifeq ($(NOSTRETCH), 0)
+	BLDENV=stretch make -f Makefile.work stretch
 endif
 
-sonic-slave-build :
-	$(DOCKER_BASE_BUILD)
-	$(DOCKER_BUILD)
-
-sonic-slave-bash :
-	@docker inspect --type image $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG) &> /dev/null || \
-	    { echo Image $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG) not found. Building... ; \
-	    $(DOCKER_BASE_BUILD) ; }
-	@docker inspect --type image $(SLAVE_IMAGE):$(SLAVE_TAG) &> /dev/null || \
-	    { echo Image $(SLAVE_IMAGE):$(SLAVE_TAG) not found. Building... ; \
-	    $(DOCKER_BUILD) ; }
-	@$(INSMOD_OVERLAY)
-	@$(DOCKER_RUN) -t $(SLAVE_IMAGE):$(SLAVE_TAG) bash
-
-showtag:
-	@echo $(SLAVE_IMAGE):$(SLAVE_TAG)
-	@echo $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG)
-
-init :
-	@git submodule update --init --recursive
-	@git submodule foreach --recursive '[ -f .git ] && echo "gitdir: $$(realpath --relative-to=. $$(cut -d" " -f2 .git))" > .git'
-
-reset :
-	@echo && echo -n "Warning! All local changes will be lost. Proceed? [y/N]: "
-	@read ans && \
-	 if [ $$ans == y ]; then \
-	     git clean -xfdf; \
-	     git reset --hard; \
-	     git submodule foreach --recursive git clean -xfdf; \
-	     git submodule foreach --recursive git reset --hard; \
-	     git submodule update --init --recursive;\
-	 else \
-	     echo "Reset aborted"; \
-	 fi
+clean reset init configure showtag sonic-slave-build sonic-slave-bash :
+	@echo "+++ Making $@ +++"
+	make -f Makefile.work $@
diff --git a/Makefile.work b/Makefile.work
new file mode 100644
index 0000000000..2dfab32748
--- /dev/null
+++ b/Makefile.work
@@ -0,0 +1,147 @@
+###############################################################################
+## Wrapper for starting make inside sonic-slave container
+#
+#  Supported parameters:
+#
+#  * PLATFORM: Specific platform we wish to build images for.
+#  * BUILD_NUMBER: Desired version-number to pass to the building-system.
+#  * ENABLE_DHCP_GRAPH_SERVICE: Enables get-graph service to fetch minigraph files
+#    through http.
+#  * SHUTDOWN_BGP_ON_START: Sets admin-down state for all bgp peerings after restart.
+#  * ENABLE_PFCWD_ON_START: Enable PFC Watchdog (PFCWD) on server-facing ports
+#  * by default for TOR switch.
+#  * SONIC_ENABLE_SYNCD_RPC: Enables rpc-based syncd builds.
+#  * USERNAME: Desired username -- default at rules/config
+#  * PASSWORD: Desired password -- default at rules/config
+#  * KEEP_SLAVE_ON: Keeps slave container up after building-process concludes.
+#  * SOURCE_FOLDER: host path to be mount as /var/$(USER)/src, only effective when KEEP_SLAVE_ON=yes
+#  * SONIC_BUILD_JOBS: Specifying number of concurrent build job(s) to run
+#  * KERNEL_PROCURE_METHOD: Specifying method of obtaining kernel Debian package: download or build
+#
+###############################################################################
+
+SHELL = /bin/bash
+
+USER := $(shell id -un)
+PWD := $(shell pwd)
+
+ifeq ($(USER), root)
+$(error Add your user account to docker group and use your user account to make. root or sudo are not supported!)
+endif
+
+# Remove lock file in case previous run was forcefully stopped
+$(shell rm -f .screen)
+
+MAKEFLAGS += -B
+
+ifeq ($(BLDENV), stretch)
+SLAVE_BASE_TAG = $(shell sha1sum sonic-slave-stretch/Dockerfile | awk '{print substr($$1,0,11);}')
+SLAVE_TAG = $(shell cat sonic-slave-stretch/Dockerfile.user sonic-slave-stretch/Dockerfile | sha1sum | awk '{print substr($$1,0,11);}')
+SLAVE_BASE_IMAGE = sonic-slave-stretch-base
+SLAVE_IMAGE = sonic-slave-stretch-$(USER)
+SLAVE_DIR = sonic-slave-stretch
+else
+SLAVE_BASE_TAG = $(shell sha1sum sonic-slave/Dockerfile | awk '{print substr($$1,0,11);}')
+SLAVE_TAG = $(shell cat sonic-slave/Dockerfile.user sonic-slave/Dockerfile | sha1sum | awk '{print substr($$1,0,11);}')
+SLAVE_BASE_IMAGE = sonic-slave-base
+SLAVE_IMAGE = sonic-slave-$(USER)
+SLAVE_DIR = sonic-slave
+endif
+
+INSMOD_OVERLAY := sudo modprobe overlay
+DOCKER_RUN := docker run --rm=true --privileged \
+    -v $(PWD):/sonic \
+    -w /sonic \
+    -e "http_proxy=$(http_proxy)" \
+    -e "https_proxy=$(https_proxy)" \
+    -i$(if $(TERM),t,)
+
+DOCKER_BASE_BUILD = docker build --no-cache \
+		    -t $(SLAVE_BASE_IMAGE) \
+		    --build-arg http_proxy=$(http_proxy) \
+		    --build-arg https_proxy=$(https_proxy) \
+		    $(SLAVE_DIR) && \
+		    docker tag $(SLAVE_BASE_IMAGE):latest $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG)
+
+DOCKER_BUILD = docker build --no-cache \
+	       --build-arg user=$(USER) \
+	       --build-arg uid=$(shell id -u) \
+	       --build-arg guid=$(shell id -g) \
+	       --build-arg hostname=$(shell echo $$HOSTNAME) \
+	       -t $(SLAVE_IMAGE) \
+	       -f $(SLAVE_DIR)/Dockerfile.user \
+	       $(SLAVE_DIR) && \
+	       docker tag $(SLAVE_IMAGE):latest $(SLAVE_IMAGE):$(SLAVE_TAG)
+
+SONIC_BUILD_INSTRUCTION :=  make \
+                           -f slave.mk \
+                           PLATFORM=$(PLATFORM) \
+                           BUILD_NUMBER=$(BUILD_NUMBER) \
+                           ENABLE_DHCP_GRAPH_SERVICE=$(ENABLE_DHCP_GRAPH_SERVICE) \
+                           SHUTDOWN_BGP_ON_START=$(SHUTDOWN_BGP_ON_START) \
+                           SONIC_ENABLE_PFCWD_ON_START=$(ENABLE_PFCWD_ON_START) \
+                           ENABLE_SYNCD_RPC=$(ENABLE_SYNCD_RPC) \
+                           PASSWORD=$(PASSWORD) \
+                           USERNAME=$(USERNAME) \
+                           SONIC_BUILD_JOBS=$(SONIC_BUILD_JOBS) \
+                           KERNEL_PROCURE_METHOD=$(KERNEL_PROCURE_METHOD) \
+                           HTTP_PROXY=$(http_proxy) \
+                           HTTPS_PROXY=$(https_proxy) \
+                           SONIC_ENABLE_SYSTEM_TELEMETRY=$(ENABLE_SYSTEM_TELEMETRY)
+
+.PHONY: sonic-slave-build sonic-slave-bash init reset
+
+.DEFAULT_GOAL :=  all
+
+%::
+	@docker inspect --type image $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG) &> /dev/null || \
+	    { echo Image $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG) not found. Building... ; \
+	    $(DOCKER_BASE_BUILD) ; }
+	@docker inspect --type image $(SLAVE_IMAGE):$(SLAVE_TAG) &> /dev/null || \
+	    { echo Image $(SLAVE_IMAGE):$(SLAVE_TAG) not found. Building... ; \
+	    $(DOCKER_BUILD) ; }
+	@$(INSMOD_OVERLAY)
+ifeq "$(KEEP_SLAVE_ON)" "yes"
+    ifdef SOURCE_FOLDER
+		@$(DOCKER_RUN) -v $(SOURCE_FOLDER):/var/$(USER)/src $(SLAVE_IMAGE):$(SLAVE_TAG) bash -c "$(SONIC_BUILD_INSTRUCTION) $@; /bin/bash"
+    else
+		@$(DOCKER_RUN) $(SLAVE_IMAGE):$(SLAVE_TAG) bash -c "$(SONIC_BUILD_INSTRUCTION) $@; /bin/bash"
+    endif
+else
+	@$(DOCKER_RUN) $(SLAVE_IMAGE):$(SLAVE_TAG) $(SONIC_BUILD_INSTRUCTION) $@
+endif
+
+sonic-slave-build :
+	$(DOCKER_BASE_BUILD)
+	$(DOCKER_BUILD)
+
+sonic-slave-bash :
+	@docker inspect --type image $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG) &> /dev/null || \
+	    { echo Image $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG) not found. Building... ; \
+	    $(DOCKER_BASE_BUILD) ; }
+	@docker inspect --type image $(SLAVE_IMAGE):$(SLAVE_TAG) &> /dev/null || \
+	    { echo Image $(SLAVE_IMAGE):$(SLAVE_TAG) not found. Building... ; \
+	    $(DOCKER_BUILD) ; }
+	@$(INSMOD_OVERLAY)
+	@$(DOCKER_RUN) -t $(SLAVE_IMAGE):$(SLAVE_TAG) bash
+
+showtag:
+	@echo $(SLAVE_IMAGE):$(SLAVE_TAG)
+	@echo $(SLAVE_BASE_IMAGE):$(SLAVE_BASE_TAG)
+
+init :
+	@git submodule update --init --recursive
+	@git submodule foreach --recursive '[ -f .git ] && echo "gitdir: $$(realpath --relative-to=. $$(cut -d" " -f2 .git))" > .git'
+
+reset :
+	@echo && echo -n "Warning! All local changes will be lost. Proceed? [y/N]: "
+	@read ans && \
+	 if [ $$ans == y ]; then \
+	     git clean -xfdf; \
+	     git reset --hard; \
+	     git submodule foreach --recursive git clean -xfdf; \
+	     git submodule foreach --recursive git reset --hard; \
+	     git submodule update --init --recursive;\
+	 else \
+	     echo "Reset aborted"; \
+	 fi
diff --git a/README.md b/README.md
index e09c4e2c28..9b667661cd 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,7 @@ To build SONiC installer image and docker images, run the following commands:
     # Execute make configure once to configure ASIC
     make configure PLATFORM=[ASIC_VENDOR]
 
-    # build debian stretch required targets
+    # build debian stretch required targets (optional)
     BLDENV=stretch make stretch
 
     # build SONiC image