Hello, I think I found a Linux tutorial for installing on Linux: https://deeponion.org/community/support-tickets/knowledge-base/linux-build-qt-wallet-on-ubuntu-article-video.6/
There is also a Steemit link in the post: https://steemit.com/deeponion/@nezero/build-the-deeponion-qt-wallet-on-ubuntu

Either of these should tell you how to build you QT wallet on Linux.

You can find more guides on DeepOnion for Mac, Windows and inux here: https://deeponion.org/community/support-tickets/knowledge-base/category?category_id=1

Hope that helps!