running-makefile

$ cat Makefile 
CC = avr-gcc
PROCESSOR = atmega328p
FREQ = 16000000
AVRDUDE_CONFIG = arduino
AVRDUDE_PART = ATMEGA328P
AVRDUDE_PROGRAMMING_DEVICE = /dev/tty.usbmodem1411

all: build

clean:
    rm *.o *.hex blink

compile:
    $(CC) -Os -DF_CPU=$(FREQ)UL -mmcu=$(PROCESSOR) -c -o blink.o blink.c

build: compile
    $(CC) -mmcu=$(PROCESSOR) blink.o -o blink

flash: build
    avrdude -F -V -c $(AVRDUDE_CONFIG) -p $(AVRDUDE_PART) -P $(AVRDUDE_PROGRAMMING_DEVICE) -b 115200 -U flash:w:blink:e

$ make flash
avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o blink.o blink.c
avr-gcc -mmcu=atmega328p blink.o -o blink
avr-objcopy -O ihex -R .eeprom blink blink.hex
avrdude -F -V -c arduino -p ATMEGA328P -P /dev/tty.usbmodem1411 -b 115200 -U flash:w:blink.hex

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e950f
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "blink.hex"
avrdude: input file blink.hex auto detected as Intel Hex
avrdude: writing flash (176 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 176 bytes of flash written

avrdude: safemode: Fuses OK (H:00, E:00, L:00)

avrdude done.  Thank you.