composer/getcomposer.org — pull request #67 by stof (2014-05-07 14:02:09+00:00)
Title: Fixed the installer when running it with PHP 5.2

One of the checks performed by this installer is that PHP 5.3+ is used, so it should not used the FQCN to access the RuntimeException class so that the code can be parsed by PHP 5.2

Refs https://github.com/composer/composer/issues/2974