package R;
package R::startR;

##</code><code>##

package R::startR;
...
@EXPORT_OK = qw(startR ...

##</code><code>##

$ cat pm_1152700_libs/R.pm
package R;
use Exporter 'import';
our @EXPORT_OK = qw{startR};
sub startR { print 'This is &R::startR' }
1;

##</code><code>##

$ cat pm_1152700_libs/R/startR.pm
package R::startR;
use Exporter 'import';
our @EXPORT_OK = qw{startR};
sub startR { print 'This is &R::startR::startR' }
1;

##</code><code>##

#!/usr/bin/env perl -l

use strict;
use warnings;

use lib 'pm_1152700_libs';

use R qw{startR};
use R::startR qw{startR};

R::startR();
R::startR::startR();

##</code><code>##

This is &R::startR
This is &R::startR::startR

##</code><code>##

use R qw{some_startR};
use R::startR qw{other_startR};

some_startR();
other_startR();