Check during runtime if app was built with a specific feature

How to check during runtime for that?
I've tried:

 #[cfg(features = "feature_A")]
        {
println!("Feature A enabled");
        }

And:

if cfg!(features = "feature_A")
{
println!("Feature A enabled");
}

But those don't work...
What is the correct way to achieve the result?
Thank you

OK, I just got it. It needs to be feature not features...
Somewhat confusing when during build the features flag is used...