I tried to run the MQX demo project and ran into the errors caused by not having MQX_HAS_TIME_SLICE, MQX_USE_SEMAPHORES, and MQX_USE_LOGS macros defined.
I followed the instructions in the corresponding "Freescale MQX RTOS Example Guide" to add these in the user_config.h file and still had problems.
It was only after I edited the small_ram_config.h file that I was able to compile and run.
It would appear to me that the user_config.h file is not included anywhere in the source code. All I could find was a mention of it in the mqx_cnfg.h file.