https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91703
--- Comment #3 from Jordan <jordan.mayes21 at hotmail dot co.uk> --- (In reply to Richard Biener from comment #1) > Guessing some bits. Note GCC 5 is no longer supported, you should look for > a newer version of the AVR toolchain. I am very sorry, but I do not know how to do that? I am new to all of this.