diff --git a/Makefile b/Makefile
index c530388..4e7508b 100644
--- a/Makefile
+++ b/Makefile
@@ -22,14 +22,6 @@
 # SUCH DAMAGE.
 #
 
-ARMOBJDUMP?= arm-none-eabi-objdump
-ARMCC?= arm-none-eabi-gcc
-ARMTARGET?= -mcpu=cortex-m3 -mthumb -DSTROBE_SINGLE_THREAD=1
-
-# Clang doesn't work due to no-nano libc
-#ARMCC?=clang-mp-9.0
-#ARMTARGET?= -nostdlib -ffreestanding -target arm-none-eabi -mcpu=cortex-m3 -mfloat-abi=soft  -mthumb
-
 .if $(.OBJDIR) == $(.CURDIR)
 .error Need to set MAKEOBJDIR.
 .endif
@@ -79,9 +71,6 @@ LIBSYOTE_TEST = libsyote_test.$(SOEXT)
 $(LIBSYOTE_TEST): $(LIBSYOTE_TEST_OBJS)
 	$(CC) -shared -o $@ $(.ALLSRC)
 
-.MAIN: all
-.PHONY: all
-
 DEPENDS = .arm_deps .test_deps
 .PHONY: $(DEPENDS)
 depend: $(DEPENDS)
@@ -105,22 +94,6 @@ rng_save.c: Makefile
 .test_deps: $(LIBSYOTE_TEST_SRCS)
 	$(CC) $(CFLAGS) $(.ALLSRC) -MM | sed -e 's/\.o:/\.no:/' > $@ || (rm -f $@ && false)
 
-.for i in $(PROGS)
-ALLTGTS+= $(i)$(PROGEXT) $(i).list
-ASRCS.$(i) = $(SRCS) $(SRCS.$(i))
-OBJS.$(i) = $(ASRCS.$(i):C/.c$/.o/)
-
-.arm_deps: $(ASRCS.$(i))
-
-$(i)$(PROGEXT) $(i).map: $(OBJS.$(i))
-	$(ARMCC) $(ARMTARGET) -o $(i)$(PROGEXT) $(.ALLSRC) -T$(LINKER_SCRIPT) --specs=nosys.specs -Wl,-Map="$(i).map" -Wl,--gc-sections -static --specs=nano.specs -Wl,--start-group -lc -lm -Wl,--end-group
-
-$(i).list: $(i)$(PROGEXT)
-	$(ARMOBJDUMP) -h -S $(.ALLSRC) > $@ || (rm -f $@ && false)
-.endfor
-
-all: $(ALLTGTS)
-
 .PHONY: runbuild
 runbuild: $(SRCS) Makefile mk/*.mk
 	for i in $(.MAKEFILE_LIST) $(.ALLSRC) $$(cat $(DEPENDS) | gsed ':x; /\\$$/ { N; s/\\\n//; tx }' | sed -e 's/^[^:]*://'); do if [ "$$i" != ".." ]; then echo $$i; fi; done | sort -u | entr -d sh -c 'echo starting...; cd $(.CURDIR) && $(MAKE) $(.MAKEFLAGS) depend && $(MAKE) $(.MAKEFLAGS) all'
@@ -149,14 +122,6 @@ $(.OBJDIR)/shared_key.h:
 
 	(cmp shared_key.h.tmp shared_key.h >/dev/null 2>&1 && rm shared_key.h.tmp) || mv shared_key.h.tmp shared_key.h
 
-# native objects
-.SUFFIXES: .no
-.c.no:
-	$(CC) $(CFLAGS) -c $< -o $@
-
-.c.o:
-	$(ARMCC) $(ARMTARGET) $(CFLAGS) -c $< -o $@
-
 STROBE_NAME = strobe
 STROBE_REPO = https://git.code.sf.net/p/strobe/code
 STROBE_BRANCH = master
@@ -193,3 +158,5 @@ test-diag:
 
 # hard coded dependancy for when "make depend" has not been run.
 irr_main.o: $(.OBJDIR)/shared_key.h
+
+.include <mk/mu.progs.mk>
diff --git a/mk/boards.mk b/mk/boards.mk
index 8d53689..ce5e6a9 100644
--- a/mk/boards.mk
+++ b/mk/boards.mk
@@ -1,12 +1,19 @@
 SRCS.NODE151+= board.c
 SRCS.NODE151+= misc.c
 
+ARMOBJDUMP?= arm-none-eabi-objdump
+ARMCC?= arm-none-eabi-gcc
+
+# Clang doesn't work due to no-nano libc
+#ARMCC?=clang-mp-9.0
+#ARMTARGET?= -nostdlib -ffreestanding -target arm-none-eabi -mcpu=cortex-m3 -mfloat-abi=soft  -mthumb
+
 .include <mk/mu.opts.mk>
 
 # Strobe
 .if ${MK_STROBE} == "yes"
 .PATH: $(.CURDIR)/strobe
-CFLAGS+= -I$(.CURDIR)/strobe
+CFLAGS+= -I$(.CURDIR)/strobe -DSTROBE_SINGLE_THREAD=1
 STROBE_SRCS+= strobe.c \
 	x25519.c
 .endif
@@ -27,6 +34,7 @@ SRCS+= adc-board.c delay-board.c gpio-board.c rtc-board.c lpm-board.c sx1276mb1l
 
 # NODE151 Microcontroller
 .if ${MK_NODE151} == "yes"
+ARMTARGET?= -mcpu=cortex-m3 -mthumb
 STM32=$(.CURDIR)/stm32
 .PATH: $(STM32)/l151ccux
 LINKER_SCRIPT=$(STM32)/l151ccux/STM32L151CCUX_FLASH.ld
diff --git a/mk/mu.progs.mk b/mk/mu.progs.mk
new file mode 100644
index 0000000..a50a7ed
--- /dev/null
+++ b/mk/mu.progs.mk
@@ -0,0 +1,26 @@
+.MAIN: all
+.PHONY: all
+
+.for i in $(PROGS)
+ALLTGTS+= $(i)$(PROGEXT) $(i).list
+ASRCS.$(i) = $(SRCS) $(SRCS.$(i))
+OBJS.$(i) = $(ASRCS.$(i):C/.c$/.o/)
+
+.arm_deps: $(ASRCS.$(i))
+
+$(i)$(PROGEXT) $(i).map: $(OBJS.$(i))
+	$(ARMCC) $(ARMTARGET) -o $(i)$(PROGEXT) $(.ALLSRC) -T$(LINKER_SCRIPT) --specs=nosys.specs -Wl,-Map="$(i).map" -Wl,--gc-sections -static --specs=nano.specs -Wl,--start-group -lc -lm -Wl,--end-group
+
+$(i).list: $(i)$(PROGEXT)
+	$(ARMOBJDUMP) -h -S $(.ALLSRC) > $@ || (rm -f $@ && false)
+.endfor
+
+all: $(ALLTGTS)
+
+# native objects
+.SUFFIXES: .no
+.c.no:
+	$(CC) $(CFLAGS) -c $< -o $@
+
+.c.o:
+	$(ARMCC) $(ARMTARGET) $(CFLAGS) -c $< -o $@