diff -Naur mpop-1.4.23.orig/src/base64.h mpop-1.4.23/src/base64.h
--- mpop-1.4.23.orig/src/base64.h	2026-06-26 07:27:54.000000000 +0000
+++ mpop-1.4.23/src/base64.h	2026-07-04 00:00:00.000000000 +0000
@@ -18,6 +18,7 @@
 #define BASE64_H
 
 #include <stddef.h>
+#include <stdbool.h>
 typedef size_t idx_t;
 
 #ifdef __cplusplus