Programming Arduino Uno in pure C | Freedom Embedded
Pololu - Programming Orangutans and the 3pi Robot from AVR Studio 4
GitHub - vladbelous/tinyAVR_gcc_setup: Notes on building/setting up GCC for AVR target, specifically making it work with the new tinyAVR 1-series microcontrollers.
AVR GCC Toolchain - Setup for Windows - TINUSAUR
gcc - Compiler defined symbol not found from code - Stack Overflow
Getting Started with C Programming for the ATMEL AVR Microcontrollers - ATMega32 AVR