The /System/Library/Perl and /System/Library/Perl/darwin directories hold all user-installed modules and user-installed darwin-specific code (whether that's modules or compiled XS code).

Actually, it is the other way around: /System/Library/Perl is the vendor_perl directory, and site_perl is /Library/Perl.

Apple-shipped stuff is in /System/Library/Perl, CPAN modules go to /Library/Perl.

And starting with Mac OS X 10.3, under both of these directories are Perl-version-specific subdirectories (so that you can have different Perl version concurrently).

The Perl that ships with 10.3 has this search path: 

 @INC:
    /System/Library/Perl/5.8.1/darwin-thread-multi-2level
    /System/Library/Perl/5.8.1
    /Library/Perl/5.8.1/darwin-thread-multi-2level
    /Library/Perl/5.8.1
    /Library/Perl
    /Network/Library/Perl/5.8.1/darwin-thread-multi-2level
    /Network/Library/Perl/5.8.1
    /Network/Library/Perl
    .

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In reply to Re^2: Mac Perl Package Question by Thilosophy
in thread Mac Perl Package Question by RobertJ

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