I have no idea. Tried with 
-UHAS_STRTOD -Ud_strtod -A undef:HAS_STRTOD -A undef:d_strtod

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but it still gives 
./perl -MConfig -wE 'say $Config{d_strtod}'
define

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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re: Configuring perl such that HAS_STRTOD is not defined by choroba
in thread Configuring perl such that HAS_STRTOD is not defined by syphilis

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