Code::Blocks and wxSmith

I just installed Code::Blocks and wxSmith plug-in. I simply added a couple of buttons to a form and tried to run it. I got the following error:

fatal error: wx/app.h: No such file or directory

Can someone please tell me what I need to load that I didn't? I use Linux Mint and both Code::Blocks and wxSmith from the repository. I can't see where I missed anything. But it seems I did.
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