By default local::lib installs itself and the CPAN modules into ~/perl5. sometimes, this is not what you want. you can disable it

local::lib will use PERL_MB_OPT, PERL_MM_OPT

# user perl -V to show this
PERL_MB_OPT="--install_base "/home/hwu/perl5""


export PERL_MB_OPT 
export PERL_MM_OPT 

or better way

eval $(perl -Mlocal::lib=--deactivate-all)
unset PERL_MB_OPT;
unset PERL_MM_OPT;

after this. cpanm will install the previous location