Well, per the INSTALL.txt in this module:
Prerequisites:
--------------
Perl version 5.000 or higher, and an ANSI C compiler. (!)
^^^^^^
If you plan to use the modules "Date::Calendar" or
"Date::Calendar::Year" from this package, you will
also need the module "Bit::Vector" version 5.7 or
newer (which also needs an ANSI C compiler!).
Otherwise you may safely ignore the warning message
"Warning: prerequisite Bit::Vector 5.7 not found at ..."
when running "perl Makefile.PL".
You can install "Bit::Vector" at any time later if you
change your mind.
------------------------
I do not plan to use the Calender & Year Modules. Hence no need to install the
Bit::Vector module.
Regards
Anand
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