Hi Wellenreiter. Thanks for your reply.

It seems all the dependencies are met now. I have even switched to bdb5.3 even though I would prefer to stick with 5.1.
The only libprotobuf-dev can not be upgraded to >= 2.6.1 from 2.5.0-9 without messing up the whole LTS system, but I think it is not the case.
Basically no progress, the result is still the same. It must have something to do with QtPrintSupport and QJsonObject.

What were "special compiling options" mentioned by entertheabyss?
Can I use older wallet versions that got build flawlessly?

I know many users are not aware of such details as they use binaries or even not.
Anyway I believe serious vendors evaluate the code quality to determine the team capability.
Therefore this situation doesn't help FTC getting shining again at all.