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    /path/to/current/perl -V':.*' | sed -e 's/^/-D/'

    perl -V':.*' | egrep -v '(^PERL_|^api_|5\.6\.0)' | sed -e 's/^/-D/
+'

    Configure `perl -V':.*' | egrep -v '(^PERL_|^api_|5\.6\.0)' | sed 
+-e 's/^/-D/'`