After upgrading to SabreDAV2/VObject3, new packages are required.
Use git master head from rI. This will start the 0.4.x series.
Dependencies are listed in composer.json and shall be installed as individual php-* packages (T55).
Use composer-dist.json to just build a local autoloader for the iRony project which is configured to load classes from /usr/share/php/ and /usr/share/pear/