private function requireComposerPackage($package)
    {
        $composer = $this->findComposer();
        $process = new Process($composer.' require '.$package.''.$this->getDevOption(),
                       null, null, null, null);
        $this->output->writeln('<info>Running composer require '.$package.$this->getDevOption().'</info>');
        $process->run(function ($type, $line) {
            $this->output->write($line);
        });
    }