cc -O2 -pipe -pthread -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations complex/CMPLXF.c -o complex/CMPLXF -D_POSIX_C_SOURCE=202405L -lm -lpthread complex/CMPLXF.c:3:2: error: "CMPLXF is not defined" #error "CMPLXF is not defined" ^ 1 error generated.