http://www.perlmonks.org?node_id=1050151

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

does your cpan client disable sitecustomize.pl ? PERL5OPT?

I thought I'd fun up an install I have with sitecustomize.pl with 

    use Data::Dump  qw/ dd pp       /;
    use Time::HiRes qw/ time sleep  /;
    use Benchmark   qw/ cmpthese    /;

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After about a year I noticed some tests failing because of time ( 1376987115 != 1376987115.29688 )

Even if I used  $ENV{PERL5OPT}=q{ -MData::Dump=dd,pp -MTime::HiRes=time,sleep -MBenchmark=cmpthese }; the same tests would fail

I think pretty much all cpan clients let these options though, so now I switched to 

my $cpanclients =  grep { exists $ENV{$_} } qw{
    AUTOMATED_TESTING
    NONINTERACTIVE_TESTING
    EXTENDED_TESTING
    RELEASE_TESTING
    AUTHOR_TESTING 
    PERL5_CPANPLUS_IS_VERSION
    PERL5_CPANPLUS_IS_RUNNING
    PERL5_CPAN_IS_RUNNING
    CPAN_SHELL_LEVEL
};;;;;;

use if !$cpanclients qw/ Data::Dump dd pp          /;
use if !$cpanclients qw/ Time::HiRes time sleep    /;
use if !$cpanclients qw/ Benchmark cmpthese        /;

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I can understand inheriting @INC changes, but not all the other stuff

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