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