better performance and stability
https://github.com/composer/composer/blob/1.7.2/src/Composer/Downloader/ZipDownloader.php#L70-L73
Summary: Dependency Manager for PHP
Name: composer
Version: 1.7.2
-Release: 1
+Release: 2
License: MIT
Group: Development/Languages/PHP
Source0: https://github.com/composer/composer/archive/%{version}/%{name}-%{version}.tar.gz
Requires: php-symfony2-Console >= 2.7.7
Requires: php-symfony2-Finder >= 2.7.7
Requires: php-symfony2-Process >= 2.7.7
+Requires: unzip
Suggests: bash-completion-%{name}
Suggests: git-core
Suggests: mercurial