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    }
    
    my $out = {};

    for my $p(@$precision) {
	die "precision: $p is not a valid fftw precision ($_our_precisions allowed)" 
	    unless( $_valid_precisions->{$p} );
	my $pp = $_valid_precisions->{$p}->[0];
	my $s;

	chomp( $s = `$pkgconfig --silence-errors --libs fftw3$pp` );

	if($s) {
	    $out->{$p} = "fftw3$pp";
	}
    }
    
    if(keys %$out) {
	return $out;
    } else {
	return undef;