Those @INC directories are set at build time (so I suppose you didn't build the perl binary yourself).  And the Configure default is to include (compatible) directories of other Perl installations found on the build system.  See INSTALL (Coexistence with earlier versions...).

In reply to Re: Cygwin Perl: Question about default @INC by Eliya
in thread Cygwin Perl: Question about default @INC by rovf

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