clang -O2  -Wall -Wextra -Werror=implicit-function-declaration threads/cnd_broadcast.c -o threads/cnd_broadcast -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
threads/cnd_broadcast.c:3:10: fatal error: 'threads.h' file not found
#include <threads.h>
         ^
1 error generated.