-AO_CFLAGS=-I. -I$(TOPDIR)/lpc -I$(TOPDIR)/core -I$(TOPDIR)/drivers -I$(TOPDIR)/product -I$(TOPDIR)
-LPC_CFLAGS=-std=gnu99 -mlittle-endian -mcpu=cortex-m0 -mthumb -ffreestanding -nostdlib $(AO_CFLAGS)
+WARN_FLAGS=-Wall -Wextra -Werror -Wcast-align
+
+AO_CFLAGS=-I. -I$(TOPDIR)/lpc -I$(TOPDIR)/kernel -I$(TOPDIR)/drivers \
+ -DNEWLIB_INTEGER_PRINTF_SCANF \
+ -I$(TOPDIR)/product -I$(TOPDIR) -I$(TOPDIR)/math -I$(TOPDIR) \
+ -isystem $(NEWLIB_NANO)/arm-none-eabi/include
+
+LPC_CFLAGS=-std=gnu99 -mlittle-endian -mcpu=cortex-m0 -mthumb\
+ -ffreestanding -nostdlib $(AO_CFLAGS) $(WARN_FLAGS)