subfile="https://www.mirrorservice.org/sites/ftp.gnu.org/gnu/mpfr/mpfr-4.2.1.tar.xz" subfile_bkup="https://ftp.nluug.nl/pub/gnu/mpfr/mpfr-4.2.1.tar.xz" subhash="bc68c0d755d5446403644833ecbb07e37360beca45f474297b5d5c40926df1efc3e2067eecffdf253f946288bcca39ca89b0613f545d46a9e767d1d4cf358475"