Build/Compile GCC 11 in debian

compile-gcc11-debian.sh

#!/bin/bash

[ -f ~/app/gcc-11.1.0.tar.xz ] || \
    wget -O ~/app/gcc-11.1.0.tar.xz http://ftp.tsukuba.wide.ad.jp/software/gcc/releases/gcc-11.1.0/gcc-11.1.0.tar.xz

[ -d ~/app/gcc-11.1.0 ] || tar -C ~/app -xvf ~/app/gcc-11.1.0.tar.xz

apt update
apt install -y \
    wget xz-utils bzip2 make autoconf gcc-multilib g++-multilib \
    libmpc-dev libgmp-dev

## Required for gcc

cd ~/app/gcc-11.1.0
 ./contrib/download_prerequisites
 
mkdir -p build && cd build

../configure --program-prefix=v11- --enable-languages=c,c++ --prefix=$HOME/app/gcc1
make -j3