Configuration.h has #define MOTHERBOARD 34 but see MB in code.

I have Arduino IDE 1.6.6 with the Marlin firmware code. I have a Sainsmart with the Mega2650 io board. My printer is a Replikeo Prusa i3.
In the Marlin code is see the #define MOTHERBOARD 34, but through out the code the reference is MB. So naturally the compile finishes with errors.
There are also other reference names missing or incorrect.
Am I missing something here? I have 30yrs exp in C and have never seen a delivery like this.
I am open to being set straight on this issue if I have serioulsy missed something here.
Thank you in advance. My printer robot has an open mind but needs some thoughts.

In boards.h you will see
#define MB(board) (MOTHERBOARD==BOARD_##board)

Unless you have changed something there should be no problem compiling.
What is your error you are getting.

Older IDE versions like 1.0.5 are recommended from many people to use with marlin. I´m using IDE 1.6.5 on Win7 and Win 8.1 without errors.
-Olaf

Switched to windows and the comile process is fine now. Thanks to both of you.

What were you on? I've been running 1.6.x on Linux cleanly for months . . fwiw . . .

- Tim

I switched back to the stable windows version. I had inadvertently installed the newer beta version, from what I can remember. I did not get back to this issue once I got past it. I have a large litany of configuration steps and testing to go through.