public function buildImages(string $directory, string $projectName) {

		$this->requireProcess();

		$process = ProcessBuilder::create([
			'docker-compose', '-p', $projectName, '-f', $directory.'/docker-compose.yml', 'build'
		])
			->setTimeout(null)->getProcess();

		$this->processHelper->run($this->output, $process, null, null, OutputInterface::VERBOSITY_NORMAL);
		if($process->getExitCode() !== 0)
			throw new StartFailedException($projectName);
	}