help with converting from configure to cmake (devel/allegro)

[Eitan Adler]

I'm currently the maintainer of devel/allegro which, due to my lack of
time, is very outdated.
The allegro team switched to cmake for the recent version. I do not
know how to enable/disable specific options with cmake in the ports
system.
I attached the Makefile I am currently using (which builds perfectly
without any options enabled). I'm looking for the correct way to
change the configure_args to something that will actually work.

If anyone notices anything else of importance please let me know.
Portlint finds no problems.
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