diff -puriN php-5.6.40-2021-05.orig/ext/intl/breakiterator/codepointiterator_internal.cpp php-5.6.40/ext/intl/breakiterator/codepointiterator_internal.cpp
--- php-5.6.40-2021-05.orig/ext/intl/breakiterator/codepointiterator_internal.cpp	2020-08-02 03:14:37.000000000 -0500
+++ php-5.6.40/ext/intl/breakiterator/codepointiterator_internal.cpp	2021-05-19 04:30:23.000000000 -0500
@@ -17,6 +17,7 @@
 #include "codepointiterator_internal.h"
 #include <unicode/uchriter.h>
 #include <typeinfo>
+#include "../intl_cppshims.h"
 
 //copied from cmemory.h, which is not public
 typedef union {
diff -puriN php-5.6.40-2021-05.orig/ext/intl/intl_cppshims.h php-5.6.40/ext/intl/intl_cppshims.h
--- php-5.6.40-2021-05.orig/ext/intl/intl_cppshims.h	2019-01-09 03:54:13.000000000 -0600
+++ php-5.6.40/ext/intl/intl_cppshims.h	2021-05-19 04:28:02.000000000 -0500
@@ -31,4 +31,15 @@
 #define _MSC_STDINT_H_ 1
 #endif
 
+extern "C" {
+#include <stdbool.h>
+#ifndef TRUE
+#define TRUE true
 #endif
+#ifndef FALSE
+#define FALSE false
+#endif
+}
+
+#endif
+
diff -puriN php-5.6.40-2021-05.orig/ext/intl/php_intl.h php-5.6.40/ext/intl/php_intl.h
--- php-5.6.40-2021-05.orig/ext/intl/php_intl.h	2019-01-09 03:54:13.000000000 -0600
+++ php-5.6.40/ext/intl/php_intl.h	2021-05-19 04:18:51.000000000 -0500
@@ -21,6 +21,13 @@
 #define PHP_INTL_H
 
 #include <php.h>
+#include <stdbool.h>
+#ifndef TRUE
+#define TRUE true
+#endif
+#ifndef FALSE
+#define FALSE false
+#endif
 
 /* Even if we're included from C++, don't introduce C++ definitions
  * because we were included with extern "C". The effect would be that