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$ git checkout v5.28.0
$ git clean -dxf
...
$ make
$ ./perl -Ilib -MConfig -le 'print $Config{d_strtod}//"undef"'
undef

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$ sh Configure -des
$ perl -i.bak -pe "s/^d_strtod(?:_l)?=\K.*$/'undef'/" config.sh
$ sh Configure -S
$ make
# etc.