diff --git a/src/stm32/Makefile.inc b/src/stm32/Makefile.inc
index f3994e44..ac8f4c63 100644
--- a/src/stm32/Makefile.inc
+++ b/src/stm32/Makefile.inc
@@ -1,11 +1,12 @@
 CROSS_COMPILE ?= arm-none-eabi-
 CC = $(CROSS_COMPILE)gcc
 OBJCOPY = $(CROSS_COMPILE)objcopy
+LIBOPENCM3 ?= /usr/local/arm-none-eabi
 
-CFLAGS += -Istm32/include -mcpu=cortex-m3 -mthumb -msoft-float -DSTM32F1
+CFLAGS += -Istm32/include -mcpu=cortex-m3 -mthumb -msoft-float -DSTM32F1 -I$(LIBOPENCM3)/include
 LDFLAGS_BOOT = -lopencm3_stm32f1 -Wl,--defsym,_stack=0x20005000 \
 	-Wl,-T,stm32/blackmagic.ld -nostartfiles -lc -lnosys -Wl,-Map=mapfile \
-	-mthumb -march=armv7 -mfix-cortex-m3-ldrd -msoft-float
+	-mthumb -march=armv7 -mcpu=cortex-m3 -mfix-cortex-m3-ldrd -msoft-float -L$(LIBOPENCM3)/lib/stm32/f1
 LDFLAGS = $(LDFLAGS_BOOT) -Wl,-Ttext=0x8002000
 
 SRC += 	cdcacm.c	\