diff -ur percona-server-5.7.35-38.orig/include/m_string.h percona-server-5.7.35-38/include/m_string.h
--- percona-server-5.7.35-38.orig/include/m_string.h	2021-11-24 19:49:05.797848959 +0100
+++ percona-server-5.7.35-38/include/m_string.h	2021-11-24 19:49:38.519926500 +0100
@@ -193,6 +193,7 @@
 extern size_t strnlen(const char *s, size_t n);
 #endif
 
+#define is_prefix mysql_is_prefix		/* namespace sanity */
 extern int is_prefix(const char *, const char *);
 
 /* Conversion routines */
diff -ur percona-server-5.7.35-38.orig/include/mysql_com.h percona-server-5.7.35-38/include/mysql_com.h
--- percona-server-5.7.35-38.orig/include/mysql_com.h	2021-11-24 19:49:05.801848968 +0100
+++ percona-server-5.7.35-38/include/mysql_com.h	2021-11-24 19:49:38.553926581 +0100
@@ -522,6 +522,7 @@
 void net_end(NET *net);
 void net_clear(NET *net, my_bool check_buffer);
 void net_claim_memory_ownership(NET *net);
+#define net_realloc mysql_net_realloc          /* namespace sanity */
 my_bool net_realloc(NET *net, size_t length);
 my_bool	net_flush(NET *net);
 my_bool	my_net_write(NET *net,const unsigned char *packet, size_t len);
diff -ur percona-server-5.7.35-38.orig/include/mysql.h.pp percona-server-5.7.35-38/include/mysql.h.pp
--- percona-server-5.7.35-38.orig/include/mysql.h.pp	2021-11-24 19:49:05.799848964 +0100
+++ percona-server-5.7.35-38/include/mysql.h.pp	2021-11-24 19:49:38.552926579 +0100
@@ -128,7 +128,7 @@
 void net_end(NET *net);
 void net_clear(NET *net, my_bool check_buffer);
 void net_claim_memory_ownership(NET *net);
-my_bool net_realloc(NET *net, size_t length);
+my_bool mysql_net_realloc(NET *net, size_t length);
 my_bool net_flush(NET *net);
 my_bool my_net_write(NET *net,const unsigned char *packet, size_t len);
 my_bool net_write_command(NET *net,unsigned char command,
diff -ur percona-server-5.7.35-38.orig/include/my_sys.h percona-server-5.7.35-38/include/my_sys.h
--- percona-server-5.7.35-38.orig/include/my_sys.h	2021-11-24 19:49:05.798848961 +0100
+++ percona-server-5.7.35-38/include/my_sys.h	2021-11-24 19:49:38.552926579 +0100
@@ -261,6 +261,7 @@
 
 /* charsets */
 #define MY_ALL_CHARSETS_SIZE 2048
+#define default_charset_info mysql_default_charset_info	/* namespace sanity */
 extern MYSQL_PLUGIN_IMPORT CHARSET_INFO *default_charset_info;
 extern MYSQL_PLUGIN_IMPORT CHARSET_INFO *all_charsets[MY_ALL_CHARSETS_SIZE];
 extern CHARSET_INFO compiled_charsets[];
@@ -999,6 +1000,9 @@
 extern uint get_collation_number(const char *name);
 extern const char *get_charset_name(uint cs_number);
 
+#define get_charset mysql_get_charset		/* namespace sanity */
+#define get_charset_by_csname mysql_get_charset_by_csname
+
 extern CHARSET_INFO *get_charset(uint cs_number, myf flags);
 extern CHARSET_INFO *get_charset_by_name(const char *cs_name, myf flags);
 extern CHARSET_INFO *my_collation_get_by_name(MY_CHARSET_LOADER *loader,