sudo apt install build-essential wget m4 flex bison libgmp-dev libmpfr-dev libmpc-dev mkdir src && cd src tar -xvf ../gcc-10.2.0.tar.xz cd gcc-10.2.0/ mkdir build && cd build ../gcc-10.2.0/configure -v --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --prefix=/opt/gcc-10.2.0 --enable-checking=release --enable-languages=c,c++,d,fortran,go --disable-multilib --program-suffix=-10.2 make  -j 12 make install-strip export PATH="$PATH":/opt/gcc-10.2.0/bin export LD_LIBRARY_PATH="$LD_LIBRARY_PATH":/opt/gcc-10.2.0/lib64 export CC=/opt/gcc-10.2.0/bin/gcc-10.2 export CXX=/opt/gcc-10.2.0/bin/g++-10.2 https://solarianprogrammer.com/2016/10/07/building-gcc-ubuntu-linux/