Cross platform solution to undecorating a window?

This is a follow up to this question.

Since, it I can't use GLUT to undecorated windows is there a cross-platform (which should include Mac, Windows, and Ubuntu at minimum) library or way to undec开发者_运维知识库orated a window? I know there are ways to do this for individual operating systems but, I wanted a cross platform way to do it, so I looked at GLUT. Unfortunately, the only option is glutFullScreen which I do not want.

(And can it be in C++ or C too?)

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Have a look at borderless windows in Qt.

Making a borderless window with for Qt

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Yes, you can use freeglut to undecorate windows. See the second answer to the question Is it possible to make a window withouth a top in GLUT?