--- /dev/null
+ifndef TOPDIR
+TOPDIR=..
+endif
+
+include $(TOPDIR)/Makefile.defs
+
+vpath % $(TOPDIR)/stm32f1:$(AO_VPATH)
+
+CC=$(ARM_CC)
+
+STM32F1_CFLAGS=-mlittle-endian -mcpu=cortex-m3 -mthumb \
+ -I$(TOPDIR)/stm32f1 $(AO_CFLAGS) $(PICOLIBC_CFLAGS)