I am trying to use arc4random_uniform in the mentioned Xcode assembly, but it looks like it is no longer available:

Alt-click on the available functions shows that they are declared in stdlib.h and they are listed as follows:

It seems strange that he is no more. This particular stdlib.h is located in the iOS 9.0 simulator directory in usr/include/stdlib.h not sure if this helps or not.
I have the latest command line tools installed. Not sure what is going on. Any tips / help / corrections are greatly appreciated. Thanks in advance.
UPDATE
This seems to be a Xcode bug, links for which:
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