--- a/common/include/istypes.h.orig	2019-04-25 20:24:33.000000000 +0800
+++ b/common/include/istypes.h	2022-01-08 13:20:41.231765198 +0800
@@ -27,9 +27,9 @@
 #ifndef __ISFTYPES_H__
 #define __ISFTYPES_H__
 
-/** boolean type */
-typedef unsigned char bool;
-#define TRUE     (0==0)
-#define FALSE    (!TRUE)
+# include <stdbool.h>
+
+# define TRUE     (0==0)
+# define FALSE    (!TRUE)
 
 #endif /* __ISFTYPES_H__ */