Used for declaration of private function only, so change
causes no visible effects
https://bugs.gentoo.org/943734
--- a/src/timer.c
+++ b/src/timer.c
@@ -48,7 +48,7 @@
 #include <lwp/timer.h>
 #include "lwp.private.h"
 
-typedef unsigned char bool;
+#include <stdbool.h>
 
 #define expiration TotalTime