this variable will contains an error message, if check fail
An Array with all Dependency entries from the parsed XML package definition, ie:
$opts => Array ( ['type'] => 'pkg', ['rel'] => 'ge', ['version'] => '3.4', ['name'] => 'HTML_Common' );
mixed - FALSE if all dependencies could be resolved successfully(!); or an PEAR_DEPENDENCY_* constant in case of unresolved dependencies.