wget http://ftp.gnu.org/gnu/gcc/gcc-10.3.0/gcc-10.3.0.tar.gz
or
git clone git://gcc.gnu.org/git/gcc.git
> Q:
configure: error: Building GCC requires GMP 4.2+, MPFR 3.1.0+ and MPC 0.8.0+.
Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify
> A 1:
> https://gmplib.org/
> ./configure --enable-cxx
> A2:
> http://www.mpfr.org/
> A3:
> https://ftp.gnu.org/gnu/mpc/
---
> Q:
>/usr/bin/ld: cannot find crtn.o: No such file or directory
> collect2: error: ld returned 1 exit status
>
> A:
> ./configure --disable-multilib