這裏使用arch 
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安裝依賴
arch
sudo pacman -S riscv64-linux-gnu-binutils riscv64-linux-gnu-gcc riscv64-linux-gnu-gdb qemu-emulators-full 
Debian
sudo apt install git build-essential gdb-multiarch qemu-system-misc gcc-riscv64-linux-gnu binutils-riscv64-linux-gnu  
驗証依賴
三個有一個就好了
riscv64-linux-gnu-gcc
riscv64-linux-gnu-gcc --version
riscv64-linux-gnu-gcc (Debian 10.3.0-8) 10.3.0

riscv64-unknown-elf-...