cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations threads/ONCE_FLAG_INIT.c -o threads/ONCE_FLAG_INIT -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
threads/ONCE_FLAG_INIT.c:1:10: fatal error: threads.h: No such file or directory
    1 | #include <threads.h>
      |          ^~~~~~~~~~~
compilation terminated.