At first I apologize for my bad English, because I'm not good at speaking English.
I have a Question about Eclipse 4.5 settings. When RCP application runs on Eclipse IDE, the application requires plugins defined in Run Configuration. But Unfortunately only Target Platform plugins are configurable. I want to set plugins from lib folder, but is it impossible?
You can set up your Target Platform to contain multiple locations so one of them could be your lib folder.
In the Preferences go to 'Plug-in Development > Target Platform'.
Select your target platform and click 'Edit...'
In the Target Content dialog select 'Add...' to add a new Directory, ... to the target platform.
In the example below I have two locations for target platform contents: