Well the error message says it all... however if you know what you're doing (and chances are you can do differently, e.g. through hashes or proper sub references, just do a Super Search):

#!/usr/bin/perl -w

use strict;

sub foobar {
        print "Here I am!\n";
}

my $var = 'bar';

no strict "refs";

&{'foo'.$var};
[download]

You can lexically enable and disable strict as you need, always bearing in mind that you must know what you're doing...

-- TMTOWTDI