CPAN.pm is there in /usr/share/perl5

But, /usr/share/perl5 is not in @INC:

inc
/usr/local/lib64/perl5
/usr/local/share/perl5
/usr/lib64/perl5/vendor_perl
/usr/share/perl5/vendor_perl
/usr/lib64/perl/usr/share/perl5
.
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