C++ GUI libraries

What's a good GUI library for C++?

-GTK has bad compatibility and many issues on windows
-QT is bloated and is designed to use its own build system and IDE
-wxWidgets is very convoluted and strangely designed
-FLTK is great, but lacks many important features, can be buggy, and is unpolished.

What do you guys think? I realize that Java's Swing libraries can solve all of my problems, but I want to try avoiding Java as much as possible.

Had to make my own toolkit for a recent project, it was golden, no added complexity like theming or any of that bullshit, just nice flat fills, no unnecessary lines or borders, and as a result of all of this it was incredibly efficient...

I would love to reimplement something like it for the FOSS world since this particular one is part of a piece of custom software with restrictions on reuse of the code.