I download the FreeRTOS v5.0.0.
When I make AVR_ATMega323_WinAVR demo in winAVR-20080411,It has a error "prot.c:371: undefined reference to 'vTaskIncrementTick'" in "linking:rtosdemo.elf".
But I uninstall winAVR-20080411 and install winAVR-2007,then 'make clean' 、'make all',it will be ok.
I donot understand what can I do.
I am a newbie in using FreeRTOS.

Thank you for bringing this my attention. You can find the solution here:

http://www.freertos.org/a00104.html#knownissues (at the bottom of the page)

Regards.

You are welcome.I wish FreeRTOS better.