Using arc4random_uniform with cocos2d-x

I was happily using arc4random_uniform since iOS, and also for iOS targets of cocos2d-x.

Turns it doesn't work for Android, for some reason. Specifically, the error:

error: 'arc4random_uniform' was not declared in this scope

How can I get around this?

Worst case, at compile time I'd check if arc4random_uniform() exists, and if not, use some other method (like the old arc4random()...). But I really would like to avoid using different code bases for different targets here.

Any other suggestions?