で、

Base class package "DateTime" is empty.
(Perhaps you need to 'use' the module which defines that package first.) at /Users/ユーザ名/Plagger-Mac-0.1/CPAN/lib/Plagger/Date.pm line 3
BEGIN failed--compilation aborted at /Users/ユーザ名/Plagger-Mac-0.1/CPAN/lib/Plagger/Date.pm line 3.
Compilation failed in require at /Users/ユーザ名/Plagger-Mac-0.1/CPAN/lib/Plagger.pm line 22.
BEGIN failed--compilation aborted at /Users/ユーザ名/Plagger-Mac-0.1/CPAN/lib/Plagger.pm line 22.
Compilation failed in require at /Users/ユーザ名/Plagger-Mac-0.1/CPAN/bin/plagger line 11.
BEGIN failed--compilation aborted at /Users/ユーザ名/Plagger-Mac-0.1/CPAN/bin/plagger line 11.

とか、ずらずら出てるズラ。
成功したっぽいけど、failedとかたくさんあって心配ズラよ。
これでいいズラかね。