Download a package with rosmake

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Hi,

I created a stack which includes one teleop package. this package uses the library Qt and depends on the stack eros to build it. In the current state, before building my package, I need to install the eros stack by following the installation instruction: http://www.ros.org/wiki/eros/Installation

I included the necessary eros_build package as a depend in my manifest.xml, but that doesn't download and install this package or even the eros stack.

My question would be, is there a way to automatize the download of the eros stack while executing rosmake in my package, if the stack wasn't found?

Thank you for your help.