From Perl 5.6.2's Configure:

Previous version of perl5 used the standard IO mechanisms as defined in <stdio.h>. Versions 5.003_02 and later of perl allow alternate IO mechanisms via a "PerlIO" abstraction, but the stdio mechanism is still the default. This abstraction layer can use AT&T's sfio (if you already have sfio installed) or regular stdio. Using PerlIO with sfio may cause problems with some extension modules. Using PerlIO with stdio is safe, but it is slower than plain stdio and therefore is not the default.

If this doesn't make any sense to you, just accept the default 'n'. Use the experimental PerlIO abstraction layer? [n]

The default build doesn't support PerlIO, and thus doesn't support PerlIO layers (e.g. :encoding, :utf8, etc).

In reply to Re^3: Unicode file by ikegami
in thread Unicode file by anu_1

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