Library isn't installing properly

Hello,

I am trying to install this library for the arduino due, https://github.com/MarkusLange/Arduino-Due-RTC-Library , and I have installed it like I do every other additional library but for some reason when I try to compile the examples, there are a lot of errors like "" was not declared in this scope. My friend compiled the example programs on archlinux without a problem but I cannot seem to do it on windows 7. Another person had this problem and OP said that he installed in the wrong location, but sadly I cannot find the right location. I am a bit of a noob in terms of programming/microcontrollers but I am trying to learn.

Thanks

In the Arduino IDE are settings (under File). One of the settings is the location for the sketches and the "libraries" folder.