build missing modules locally details on https://medium.com/@oetiker/teach-makefile-pl-to-use-cpanm-b36ba9df487e

Makefile.PL

sub MY::postamble {
  my $self = shift;
  my %r = (%{ $self->{PREREQ_PM} || {} }, %{ $self->{BUILD_REQUIRES} || {} }, %{ $self->{TEST_REQUIRES} || {} } );
  my $modules = join " ", grep !/^perl\@/, map {  $r{$_} ? $_ .'@'. $r{$_} : $_ } keys %r;
  my $tpd = "$FindBin::RealBin/3rd";
  warn "** call 'make builddeps' to build missing dependencies ...\n";
  return <<"EOF";
builddeps: $tpd/touch
	mkdir -p $tpd
	
$tpd/touch: Makefile
	\@echo "*** INSTALLING MISSING BITS FOR TESTING ***"
	curl -L https://cpanmin.us | PERL_CPANM_HOME=$tpd \$(PERL) - -q --notest --local-lib-contained $tpd $modules && touch $tpd/touch 
EOF
}