Compiler/AWR1642: How to add build flag to .mak?

Tool/software: TI C/C++ Compiler

Hi team,

We want to add MACRO define from makefile to enable/disable some code.

There are some compile info below. But we don't know how modify .mak to insert  a CFLAG

[R4 Device/Type: awr16xx/xwr16xx] Building file: mss/mss_main.c

[R4 Device/Type: awr16xx/xwr16xx] Building file: mss/mss_srr_cli.c
[R4 Device/Type: awr16xx/xwr16xx] Building file: common/cfg.c

For example: we want to compile mss_main.c with XXXX CFLAGS(like --define=MMWAVE_L3RAM_SIZE=)

Do you have any idea that how could we modify makeifle/.mak to add external MACRO define.?

Thanks