Thanks for you suggestions: 
use Term::ReadLine;

my $pkg = Term::ReadLine->ReadLine();
print "Term::ReadLine->ReadLine() says \'$pkg\'\n";

my $pkg2 = $ENV{PERL_RL};
print "ENV(PERL_RL) says \'$pkg2\'\n";
print "\@Term::ReadLine::ISA says ", @Term::ReadLine::ISA, "\n";

[download]
gives:

$ perl ../Tools/term_check.pl
Term::ReadLine->ReadLine() says 'Term::ReadLine::Gnu'
ENV(PERL_RL) says ''
@Term::ReadLine::ISA says Term::ReadLine::GnuTerm::ReadLine::Stub

So, as far as I can tell, I am running the Gnu version.

In reply to Re^2: term::readline::gnu extra spaces on completion by daverowntree
in thread term::readline::gnu extra spaces on completion by daverowntree

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