[EBUILD] doomsday's --without-opengl configure param (open)

[Corellian]

I have read some of the documentation of doomsday (a first person shooter game) and I know I have to pass the --without-opengl parameter at the configure script, but how do it modifying the ebuild? Maybe it will be better if we try to add as a USE flag?
Something like this would be fine:

[PaulBredbury]

See ebuild docs.
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