1. If you haven't built Felix locally building Sling will fail since there is dependencies to SNAPSHOT stuff from felix. For example bundles/extensions/event has a dependency to maven-scr-plugin version 1.4.5-SNAPSHOT.
2. If you haven't built older version of Sling the current trunk will fail since maven-launchpad-plugin is version 2.0.7-SNAPSHOT and org.apache.sling.launchpad has a dependency on 2.0.5-SNAPSHOT. /Pontus
