After glancing over the SIP link, it appears as though you are permitted to write to /usr/local, but not anything else in /usr. Perhaps try changing your binary install path to /usr/local/bin?

cpan> o conf makepl_arg "INSTALLBIN=/usr/local/bin INSTALLSCRIPT=/usr/
+local/bin"

cpan> o conf commit

[download]

Then run your install again.

In reply to Re: CPAN on El Capitan by stevieb
in thread CPAN on El Capitan by rhumbliner

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