We decided to write a guide on how to install and setup the AVR GCC Toolchain manually. Back in 2014, we wrote WinAVR Setup Guide which became quite popular on our website. Unfortunately, WinAVR has not been updated since 2010. AVR GCC Toolchain is a collection of tools and libraries used to compile your code for the AVR microcontrollers. This collection includes a compiler, assembler, linker, and some libraries. Most of the tools are based on efforts from the GNU community (GCC stands for GNU Compiler Collection), and some others are developed by Microchip.