cc -O2 -Wall -o dcefclk_oflow dcefclk_oflow.c  (guest cc: 8.3 [DragonFly] Release/2019-02-22)
dcefclk_oflow.c: In function 'main':
dcefclk_oflow.c:211:22: warning: unused variable 'guard' [-Wunused-variable]
dcefclk_oflow.c:211:8: warning: unused variable 'raw' [-Wunused-variable]
BUILD_OK