public function installPackage(PackageInterface $package, InstallerInterface $installer, $isDependency = false)
    {
        if (false !== strpos($package->getName(), 'github')) {
            // install from a github endpoint
            $name = basename($package->getName(), '.git');
            $repoUrl = $package->getName();
            $package = new Package($name, $package->getRequiredVersion());
            $this->repository->setUrl($repoUrl)->setHttpClient($this->githubClient);
            $package->setRepository($this->repository);
            $packageTag = $this->repository->findPackage($package->getRequiredVersion());
            if (is_null($packageTag)) {
                throw new RuntimeException(sprintf('Cannot find package %s version %s.', $package->getName(), $package->getRequiredVersion()));
            }
        } else {
            $packageTag = $this->getPackageTag($package, true);
            $package->setRepository($this->repository);
        }

        $package->setVersion($packageTag);

        $this->updateBowerFile($package, $isDependency);

        // if package is already installed, match current version with latest available version
        if ($this->isPackageInstalled($package)) {
            $this->output->writelnInfoPackage($package, 'validate', sprintf('%s against %s#%s', $packageTag, $package->getName(), $package->getRequiredVersion()));
            $packageBower = $this->config->getPackageBowerFileContent($package);
            if ($packageTag == $packageBower['version']) {
                // if version is fully matching, there's no need to install
                return;
            }
        }

        $this->cachePackage($package);

        $this->output->writelnInstalledPackage($package);
        $installer->install($package);

        $overrides = $this->config->getOverrideFor($package->getName());
        if (array_key_exists('dependencies', $overrides)) {
            $dependencies = $overrides['dependencies'];
        } else {
            $dependencies = $package->getRequires();
        }
        if (!empty($dependencies)) {
            foreach ($dependencies as $name => $version) {
                $depPackage = new Package($name, $version);
                if (!$this->isPackageInstalled($depPackage)) {
                    $this->installPackage($depPackage, $installer, true);
                } elseif ($this->isNeedUpdate($depPackage)) {
                    $this->updatePackage($depPackage, $installer);
                }
            }
        }
    }