cc -pipe -O   -pthread -I/usr/local/include  -Wall -Wextra -Werror=implicit-function-declaration threads/cnd_timedwait.c -o threads/cnd_timedwait -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt -L/usr/local/lib  -lintl -lrt -lcrypt
threads/cnd_timedwait.c:3:10: fatal error: threads.h: No such file or directory
 #include <threads.h>
          ^~~~~~~~~~~
compilation terminated.