it works

src/blink/build.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+set -e
+TDIR=$(mktemp -d)
+BUILD=./build
+mkdir -p $BUILD
+avr-gcc -mmcu=atmega328p -DF_CPU=16000000L \
+	-DARDUINO=10607 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR \
+	-I/home/plex/.arduino15/packages/arduino/hardware/avr/1.8.6/cores/arduino \
+	-I/home/plex/.arduino15/packages/arduino/hardware/avr/1.8.6/variants/eightanaloginputs \
+	main.c -o $BUILD/main.elf
+avr-objcopy -O ihex -R .eeprom $BUILD/main.elf $BUILD/main.hex
+
+avr-size -A $BUILD/main.elf
+avrdude \
+	"-C/home/plex/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf" -v -V \
+	-patmega328p -carduino -P/dev/ttyUSB0 -b57600 -D \
+	-Uflash:w:$BUILD/main.hex:i
+

src/blink/build/main.hex

@@ -0,0 +1,10 @@
+:100000000C9434000C943E000C943E000C943E0082
+:100010000C943E000C943E000C943E000C943E0068
+:100020000C943E000C943E000C943E000C943E0058
+:100030000C943E000C943E000C943E000C943E0048
+:100040000C943E000C943E000C943E000C943E0038
+:100050000C943E000C943E000C943E000C943E0028
+:100060000C943E000C943E0011241FBECFEFD8E04C
+:10007000DEBFCDBF0E9440000C9445000C940000F0
+:0E008000CF93DF93CDB7DEB7FFCFF894FFCF5D
+:00000001FF

src/blink/main.c

@@ -0,0 +1,8 @@
+#define F_CPU 16000000UL // CPU Frequency
+#include <avr/io.h>
+#include <util/delay.h>
+
+int main(void) {
+  while (1) {
+  }
+}