cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations math/FP_FAST_FMAL.c -o math/FP_FAST_FMAL -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
math/FP_FAST_FMAL.c:4:2: error: "FP_FAST_FMAL is not defined"
#error "FP_FAST_FMAL is not defined"
 ^
1 error generated.