Help with build failure

I try to build KeepassX2 for Fedora 22. I have created a branch of a working copy, I can build it for openSUSE but, build fails for Fefora 22 with the following error:

Undefined reference to `vtable for PasswordKey'

The log is here:

I am too rusty in my C++ knowledge, not to mention that I have never worked with Qt before. Any help will be appreciated.