If you build and install binutils (for instance in $HOME), I think GCC build will use them when using --prefix to build GCC. But for GMP and MPFR, you need to set --with-gmp to the same path as --prefix. Would it be simpler to use the same --prefix to build binutils, GMP, MPFR and GCC - so defaults --with-gmp to --prefix when present?
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