#include <errno.h>
#include <math.h>
#include <signal.h>
+#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static struct sigaction sigint_action;
static struct sigaction sigterm_action;
-static _Bool loop = 1;
+static bool loop = 1;
__attribute__((noreturn)) static void exit_usage(int exit_status) /* {{{ */
{