cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_POSIX_MAPPED_FILES.c -o unistd/_POSIX_MAPPED_FILES -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
unistd/_POSIX_MAPPED_FILES.c:3:2: error: #error "_POSIX_MAPPED_FILES is not defined"
    3 | #error "_POSIX_MAPPED_FILES is not defined"
      |  ^~~~~