I'm not sure why it forces perl to be located at one of those paths. You can override it as follows and see what happens: 
\fetch -o- http://install.perlbrew.pl |
   perl -pe's/^PERL=\K.*/`which perl`/' |
      sh

[download]

In reply to Re: Installing perlbrew with a non-system perl by ikegami
in thread Installing perlbrew with a non-system perl by hkdtam

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