$ENV{PERL_MM_USE_DEFAULT}=1; $ENV{PERL_MB_OPT}='--install_base /some/path/appxyzv23/perl5'; $ENV{PERL_MM_OPT}='INSTALL_BASE=/some/path/appxyzv23/perl5'; use strict; use warnings; use CPAN; CPAN::Shell->install(qw[ AUTHOR/Module-1.23.tar.gz ... ]); ... use lib '/some/path/appxyzv23/perl5';