cc -pthread -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations dirent/DT_MQ.c -o dirent/DT_MQ -D_POSIX_C_SOURCE=202405L -lm -lpthread -liconv dirent/DT_MQ.c:3:2: error: "DT_MQ is not defined" 3 | #error "DT_MQ is not defined" | ^ 1 error generated.