https://bz.apache.org/bugzilla/show_bug.cgi?id=62631

--- dbd/apr_dbd_mysql.c	2014-09-16 11:45:15.000000000 +0000
+++ dbd/apr_dbd_mysql.c	2018-08-11 20:25:13.202562000 +0000
@@ -47,6 +47,13 @@ 
 #include "apr_strings.h"
 #include "apr_lib.h"
 #include "apr_buckets.h"
+/* MySQL 8.0 replaces my_bool with C99 bool. Earlier versions of MySQL had
+* a typedef to char. Gem users reported failures on big endian systems when
+* using C99 bool types with older MySQLs due to mismatched behavior. */
+#ifndef HAVE_TYPE_MY_BOOL
+#include <stdbool.h>
+typedef bool my_bool;
+#endif
 
 #include "apr_dbd_internal.h"
 
@@ -1262,7 +1262,7 @@
 
 static void dbd_mysql_init(apr_pool_t *pool)
 {
-#if MYSQL_VERSION_ID < 100000
+#if MYSQL_VERSION_ID < 80002
     my_init();
 #endif
     mysql_thread_init();