PWM frequency library

Hello,
This seems like it is a very useful library, but I am having trouble with it.

I imported the library and loaded up one of the examples - PWM_lib_example. It is curious that some commands , such as
" InitTimersSafe();" do not turn orange, as if the software does not recognize it as a legitimate comman
d. I have seen examples on the internet where the line, in fact is orange.
The compiler comes up with several errors, such as:

PWM_lib_example:24: error: 'InitTimersSafe' was not declared in this scope

The reason I find this curious, is that I am using the example provided with the library, without modifying the code, and it doesn't verify. Am I doing something wrong? Could the fact that I am on a Mac have anything to do with it?

UPDATE

After checking it on two Macs and getting the same problem I tested it on a Windows machine.
The command still didn't turn orange, but the out-of-the-box example compiled.
Therefore it might just be a Mac thing....