Differences in LiquidCrystal_I2C library for Mac and Windows

Does anyone know if there are differences between the LiquidCrystal_I2C.h library between Mac and Windows versions? The sketch works on my MAC but now on a PC, telling me that POSITIVE is not declared etc.... This line doesn't work:

LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

saying that POSITIVE IS NOT DECLARED IN THIS SCOPE.

Do I need a different library on a PC, like the LCD.h library? or a different one?

The libraries have code for the Arduino, not the computer running the compiler. It is completely independent of the platform you are running the compiler on. MAC or PC it's all the same as far as the Arduino libraries are concerned. There must be something you don't have installed right on the PC.

My guess is you have different versions of the library installed on each computer.