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is_windowed_mode(3alleg4) on Linux

The text 878eb5836e92, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.

Tells if you are running in windowed mode. Allegro game programming library.

is_windowed_mode(3alleg4) on Linux now