Two reported issues with gradle for the Qt 5.4.0 RC:

1. Build error on Linux: "Invalid revision: android-4.4W"
2. On Windows, Qt Quick Controls applications cannot be deployed due to the maximum path length limitation.

Both issues can be worked around by turning off Gradle in Qt Creator, so a quick solution for this would be to make ant the default for this version and then revisit Gradle later once we can figure out how to fix the issues.