Index: src/loadext.c
==================================================================
--- src/loadext.c
+++ src/loadext.c
@@ -447,11 +447,13 @@
   sqlite3_str_appendall,
   sqlite3_str_appendchar,
   sqlite3_str_reset,
   sqlite3_str_errcode,
   sqlite3_str_length,
-  sqlite3_str_value
+  sqlite3_str_value,
+  /* Version 3.25.0 and later */
+  sqlite3_create_window_function
 };
 
 /*
 ** Attempt to load an SQLite extension library contained in the file
 ** zFile.  The entry point is zProc.  zProc may be 0 in which case a

Index: src/sqlite3ext.h
==================================================================
--- src/sqlite3ext.h
+++ src/sqlite3ext.h
@@ -308,10 +308,16 @@
   void (*str_appendchar)(sqlite3_str*, int N, char C);
   void (*str_reset)(sqlite3_str*);
   int (*str_errcode)(sqlite3_str*);
   int (*str_length)(sqlite3_str*);
   char *(*str_value)(sqlite3_str*);
+  int (*create_window_function)(sqlite3*,const char*,int,int,void*,
+                            void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xFinal)(sqlite3_context*),
+                            void (*xValue)(sqlite3_context*),
+                            void (*xInv)(sqlite3_context*,int,sqlite3_value**),
+                            void(*xDestroy)(void*));
 };
 
 /*
 ** This is the function signature used for all extension entry points.  It
 ** is also defined in the file "loadext.c".
@@ -593,10 +599,12 @@
 #define sqlite3_str_appendchar         sqlite3_api->str_appendchar
 #define sqlite3_str_reset              sqlite3_api->str_reset
 #define sqlite3_str_errcode            sqlite3_api->str_errcode
 #define sqlite3_str_length             sqlite3_api->str_length
 #define sqlite3_str_value              sqlite3_api->str_value
+/* Version 3.25.0 and later */
+#define sqlite3_create_window_function sqlite3_api->create_window_function
 #endif /* !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION) */
 
 #if !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION)
   /* This case when the file really is being compiled as a loadable 
   ** extension */