x86_64-managarm-gcc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations mqueue/O_NONBLOCK.c -o mqueue/O_NONBLOCK -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt  -lintl -liconv -lintl -liconv
mqueue/O_NONBLOCK.c:4:2: error: #error "O_NONBLOCK is not defined"
    4 | #error "O_NONBLOCK is not defined"
      |  ^~~~~