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