cat test.pl
use Derp::Derp;

~/localperl/bin
❯ ./perl test.pl
Can't locate Derp/Derp.pm in @INC

See: perldoc -v @INC

You may need to install the Derp::Derp module:
https://metacpan.org/search?q=Derp::Derp

@INC entries checked:

` /home/marto/localperl/lib/site_perl/5.42.0/x86_64-linux
` /home/marto/localperl/lib/site_perl/5.42.0
` /home/marto/localperl/lib/5.42.0/x86_64-linux
` /home/marto/localperl/lib/5.42.0 at test.pl line 1.
BEGIN failed--compilation aborted at test.pl line 1.

~/localperl/bin