cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_POSIX2_LOCALEDEF.c -o unistd/_POSIX2_LOCALEDEF -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
unistd/_POSIX2_LOCALEDEF.c:4:2: error: #error "_POSIX2_LOCALEDEF is not defined"
    4 | #error "_POSIX2_LOCALEDEF is not defined"
      |  ^~~~~