arduino fatal error time.h no such file or directory

Hi i have a Delta Rostock Mini G2s dual extruder and trying to install the marlin firmware
but when i try to Verifi i only get error message:

Arduino: 1.6.5 (Windows 7), Board: “Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)”
Build options changed, rebuilding all
qr_solve.cpp:7:18: fatal error: time.h: No such file or directory
#include <time.h> ^
compilation terminated.
Error compiling.
This report would have more information with
“Show verbose output during compilation”
enabled in File > Preferences.

Whot does this mean?

That you're using a sketch that makes use of "time.h", an external library, but that library is not installed. Find the version they're referring to and install it (a brief search of the internet reveals many versions, two of them in the official arduino playground) - so if possible try to find out which version they were targeting).