> man 2 futex:
<skip/>
#include <linux/futex.h>

#include <sys/time.h>

int futex(int *uaddr, int op, int val, const struct
        timespec *timeout, int *uaddr2, int val3);
<skip/>
> cat test.c
#include <linux/futex.h>
#include <sys/time.h>
int main(void)
{
        return 0;
}
> gcc test.c 2>log
> echo $?
1

log приаттачен.