help me for IDE interface definition

got new problem, when I finished the apex tutorial(nios i), there is a lcd test file named lcd_demo1.c, I try to build it but it says nr_timer_millisecond does not defined, if I slash that line, all things goes ok except the input function, if I use the apex standard_32 example project it goes ok, and I didn't find the difference between the two excaliber.c files, how is that going?