There’s a problem with the current development branch. It’s there since commit 0ea9e33. If you #define JUCE_USE_CUSTOM_AU3_STANDALONE_APP, you get a compile error in juce_audio_plugin_client_Standalone.cpp:31:
Unknown type name ‘StandaloneFilterApp’
The START_JUCE_APPLICATION macro call was moved out, but it needs to be inside a #ifndef JUCE_USE_CUSTOM_AU3_STANDALONE_APP.
