devkitPro

So I'm following this tutorial https://www.reinterpretcast.com/writing-a-game-boy-advance-game. And I'm trying to compile the first example but this sudo arm-none-eabi-gcc main.o -mthumb-interwork -mthumb -specs=gba.specs -o main.elf causes the error arm-none-eabi-gcc: error: gba.specs: No such file...