For Ubuntu 12.04, Qt Creator 2.4.1, Qt 4.8.0 (64-bit), how does one prepare their system for creating plug-ins for QtCreator?

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http://askubuntu.com – I am interested in creating a handful of plug-ins to assist with my development using Qt Creator. When I went to create a plug-in using the "New Project" wizard, I noticed that the "Details" tab of the wizard is asking for the "Qt Creator sources" and "Qt Creator build" paths. Since I installed using the package manager, I don't have either of these. My first thought was to see if there was a qtcreator-dev package that would provide what I need, but I don't see one when I run aptitude search qtcreator. Do I need to download the sources for Qt Creator, or is there a package that I am simply n (HowTos)