Symfony 2.3 をダウンロードし php composer.phar install すると以下のようなエラーが出ることがある。 Your requirements could not be resolved to an installable set of packages. Problem 1 - Installation request for symfony/icu v1.2.0 -> satisfiable by symfony/icu[v1.2.0]. - symfony/icu v1.2.0 requires lib-icu >=4.4 -> the requested linked library icu has the wrong version installed or is missing from your system, make sure to have