Linux method to determine "CanAlphablend" is needed.

[KodeZwerg]

Hello folks, I am building at runtime a form that urgent needs alphablending else its useless.
(for this project of mine -> https://forum.lazarus.freepascal.org/index.php/topic,67254.msg517216/topicseen.html)
If the system does support an alphablended window, I do need a test for such.
I tried to search for solutions but only find tipps like "install a window manager" and "enable compositing".
Sound all total cool for me but what I like to know, how can I test at runtime if such is present and supported so I either create my alphablended form or not.

If you could help me writing a method that return me a boolean would be wonderful.
Whatever you could give, I blind trust since I can't test such on my own.

Many many kudos in advance you Linux experts!