Eclipse Plugin Development install dependencies if not installed yet

Hey guys, I'm developing a plugin for eclipse and I need some dependencies, e.g. org.eclipse.graphiti. When I export my plugin and when I build my update site, everthing works fine, until i try to install my plugin, because then the install wizard says I开发者_JAVA百科 don't have graphiti installed. How can I tell my wizard to ask if you want to install the needed plugin automatically?

Thanks for any help and ideas.

During install select the 'Contact all available update sites' checkbox in the lower part of the feature selection dialog. This allows searching all existing update sites. This might help, or if not, then add the Graphiti update site your feature.xml.