Installing Composer on C9

$ curl -s http://getcomposer.org/installer | php
...
Some settings on your machine may cause stability issues with Composer.
If you encounter issues, try to change the following:

PHP was compiled with --with-curlwrappers which will cause issues with HTTP authentication and GitHub.
Recompile it without this flag if possible

Downloading...

Composer successfully installed to: /some/weird/c9/folder/composer.phar
Use it: php composer.phar