[HOpenGL] game mode

[Andre W B Furtado]

It is said in GLUT_Game.hs that: "gameMode is highly untested because it
currently only works with WinDoze". Is this true for every (OpenGL + GLUT)
API? BTW, I'm having some difficulty in trying to make this stuff work:

In OpenGL, we only need to set a string (such as "640x480:8@60") and use it
as a parameter to glutGameModeString.

In HOpenGL, however, there is a function called "gameMode" but I can't use
it, since the type of its parameter is not exported by module GLUT_Game. Am
I missing something obvious? Can anyone tell me me how to set my game mode
correctly?

Thanks a lot,
-- Andre