Checking if your kit is complete...
Looks good
Writing Makefile for PlotCalendar

Microsoft (R) Program Maintenance Utility Version 7.10.3077
Copyright (C) Microsoft Corporation.  All rights reserved.

cp PlotCalendar/DateDesc.pm blib\lib\PlotCalendar\DateDesc.pm
cp PlotCalendar/DateTools.pm blib\lib\PlotCalendar\DateTools.pm
cp PlotCalendar/Month.pm blib\lib\PlotCalendar\Month.pm
cp PlotCalendar/Day.pm blib\lib\PlotCalendar\Day.pm

Microsoft (R) Program Maintenance Utility Version 7.10.3077
Copyright (C) Microsoft Corporation.  All rights reserved.

	C:\cpanrun\build\5-10-0\bin\perl.exe "-MExtUtils::Command::MM" "-e" "test_harness(1, 'blib\lib', 'blib\arch')" t/*.t
t/datedesc.....Undefined subroutine &PlotCalendar::DateTools::julian_day called at C:\cpanrun\depot\main\contrib-patched\perl\CPAN\src\PlotCalendar\blib\lib/PlotCalendar/DateTools.pm line 102, <DATA> line 17.
1..17
dubious
	Test returned status 255 (wstat 65280, 0xff00)
DIED. FAILED tests 1-17
	Failed 17/17 tests, 0.00% okay
t/datetools....Undefined subroutine &PlotCalendar::DateTools::julian_day called at C:\cpanrun\depot\main\contrib-patched\perl\CPAN\src\PlotCalendar\blib\lib/PlotCalendar/DateTools.pm line 72.
1..8
dubious
	Test returned status 255 (wstat 65280, 0xff00)
DIED. FAILED tests 1-8
	Failed 8/8 tests, 0.00% okay
t/day..........1..3
ok 1
ok 2
ok 3
ok
t/month........Undefined subroutine &PlotCalendar::DateTools::days_in called at C:\cpanrun\depot\main\contrib-patched\perl\CPAN\src\PlotCalendar\blib\lib/PlotCalendar/DateTools.pm line 82.
1..2
dubious
	Test returned status 9 (wstat 2304, 0x900)
DIED. FAILED tests 1-2
	Failed 2/2 tests, 0.00% okay
t/require......1..4
ok 1
ok 2
ok 3
ok 4
ok
Failed Test   Stat Wstat Total Fail  List of Failed
-------------------------------------------------------------------------------
t/datedesc.t   255 65280    17   34  1-17
t/datetools.t  255 65280     8   16  1-8
t/month.t        9  2304     2    4  1-2
Failed 3/5 test scripts. 27/34 subtests failed.
Files=5, Tests=34,  1 wallclock secs ( 0.00 cusr +  0.00 csys =  0.00 CPU)
Failed 3/5 test programs. 27/34 subtests failed.
NMAKE : fatal error U1077: 'C:\cpanrun\build\5-10-0\bin\perl.exe' : return code '0xff'
Stop.