commit 3bbb09a0598fc976d2bf8dac932b27740086c1bd
Author: Hubert Figuière <hub@figuiere.net>
Date:   Sun Dec 21 17:49:43 2025 -0500

    Port to Python 3.13
    
    Signed-off-by: Hubert Figuière <hub@figuiere.net>

diff --git a/_tkinter.c b/_tkinter.c
index e537707..dfc5789 100644
--- a/_tkinter.c
+++ b/_tkinter.c
@@ -21,7 +21,6 @@ Copyright (C) 1994 Steen Lumholt.
 
 */
 
-#define PY_SSIZE_T_CLEAN
 #ifndef Py_BUILD_CORE_BUILTIN
 #  define Py_BUILD_CORE_MODULE 1
 #endif
@@ -32,6 +31,9 @@ Copyright (C) 1994 Steen Lumholt.
 #  include "pycore_fileutils.h"   // _Py_stat()
 #endif
 
+#include "pycore_long.h"          // _PyLong_IsNegative()
+#include "pycore_sysmodule.h"     // _PySys_GetOptionalAttrString()
+
 #ifdef MS_WINDOWS
 #include <windows.h>
 #endif
@@ -135,7 +137,7 @@ _get_tcl_lib_path()
         struct stat stat_buf;
         int stat_return_value;
 
-        prefix = PyUnicode_FromWideChar(Py_GetPrefix(), -1);
+        (void) _PySys_GetOptionalAttrString("base_prefix", &prefix);
         if (prefix == NULL) {
             return NULL;
         }
@@ -143,9 +145,11 @@ _get_tcl_lib_path()
         /* Check expected location for an installed Python first */
         tcl_library_path = PyUnicode_FromString("\\tcl\\tcl" TCL_VERSION);
         if (tcl_library_path == NULL) {
+            Py_DECREF(prefix);
             return NULL;
         }
         tcl_library_path = PyUnicode_Concat(prefix, tcl_library_path);
+        Py_DECREF(prefix);
         if (tcl_library_path == NULL) {
             return NULL;
         }
@@ -959,7 +963,8 @@ AsObj(PyObject *value)
                                 (unsigned char *)(void *)&wideValue,
                                 sizeof(wideValue),
                                 PY_LITTLE_ENDIAN,
-                                /* signed */ 1) == 0) {
+                                /* signed */ 1,
+                                /* with_exceptions */ 1) == 0) {
             return Tcl_NewWideIntObj(wideValue);
         }
         PyErr_Clear();
@@ -1988,7 +1993,7 @@ _tkinter_tkapp_getboolean(TkappObject *self, PyObject *arg)
     int v;
 
     if (PyLong_Check(arg)) { /* int or bool */
-        return PyBool_FromLong(Py_SIZE(arg) != 0);
+        return PyBool_FromLong(!_PyLong_IsZero((PyLongObject *)arg));
     }
 
     if (PyTclObject_Check(arg)) {
diff --git a/clinic/_tkinter.c.h b/clinic/_tkinter.c.h
index 9103565..f43510d 100644
--- a/clinic/_tkinter.c.h
+++ b/clinic/_tkinter.c.h
@@ -2,6 +2,8 @@
 preserve
 [clinic start generated code]*/
 
+#include "pycore_modsupport.h"    // _PyArg_BadArgument()
+
 PyDoc_STRVAR(_tkinter_tkapp_eval__doc__,
 "eval($self, script, /)\n"
 "--\n"
@@ -426,7 +428,7 @@ _tkinter_tkapp_createfilehandler(TkappObject *self, PyObject *const *args, Py_ss
         goto exit;
     }
     file = args[0];
-    mask = _PyLong_AsInt(args[1]);
+    mask = PyLong_AsInt(args[1]);
     if (mask == -1 && PyErr_Occurred()) {
         goto exit;
     }
@@ -490,7 +492,7 @@ _tkinter_tkapp_createtimerhandler(TkappObject *self, PyObject *const *args, Py_s
     if (!_PyArg_CheckPositional("createtimerhandler", nargs, 2, 2)) {
         goto exit;
     }
-    milliseconds = _PyLong_AsInt(args[0]);
+    milliseconds = PyLong_AsInt(args[0]);
     if (milliseconds == -1 && PyErr_Occurred()) {
         goto exit;
     }
@@ -524,7 +526,7 @@ _tkinter_tkapp_mainloop(TkappObject *self, PyObject *const *args, Py_ssize_t nar
     if (nargs < 1) {
         goto skip_optional;
     }
-    threshold = _PyLong_AsInt(args[0]);
+    threshold = PyLong_AsInt(args[0]);
     if (threshold == -1 && PyErr_Occurred()) {
         goto exit;
     }
@@ -558,7 +560,7 @@ _tkinter_tkapp_dooneevent(TkappObject *self, PyObject *const *args, Py_ssize_t n
     if (nargs < 1) {
         goto skip_optional;
     }
-    flags = _PyLong_AsInt(args[0]);
+    flags = PyLong_AsInt(args[0]);
     if (flags == -1 && PyErr_Occurred()) {
         goto exit;
     }
@@ -741,29 +743,29 @@ _tkinter_create(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
     if (nargs < 4) {
         goto skip_optional;
     }
-    interactive = _PyLong_AsInt(args[3]);
-    if (interactive == -1 && PyErr_Occurred()) {
+    interactive = PyObject_IsTrue(args[3]);
+    if (interactive < 0) {
         goto exit;
     }
     if (nargs < 5) {
         goto skip_optional;
     }
-    wantobjects = _PyLong_AsInt(args[4]);
-    if (wantobjects == -1 && PyErr_Occurred()) {
+    wantobjects = PyObject_IsTrue(args[4]);
+    if (wantobjects < 0) {
         goto exit;
     }
     if (nargs < 6) {
         goto skip_optional;
     }
-    wantTk = _PyLong_AsInt(args[5]);
-    if (wantTk == -1 && PyErr_Occurred()) {
+    wantTk = PyObject_IsTrue(args[5]);
+    if (wantTk < 0) {
         goto exit;
     }
     if (nargs < 7) {
         goto skip_optional;
     }
-    sync = _PyLong_AsInt(args[6]);
-    if (sync == -1 && PyErr_Occurred()) {
+    sync = PyObject_IsTrue(args[6]);
+    if (sync < 0) {
         goto exit;
     }
     if (nargs < 8) {
@@ -814,7 +816,7 @@ _tkinter_setbusywaitinterval(PyObject *module, PyObject *arg)
     PyObject *return_value = NULL;
     int new_val;
 
-    new_val = _PyLong_AsInt(arg);
+    new_val = PyLong_AsInt(arg);
     if (new_val == -1 && PyErr_Occurred()) {
         goto exit;
     }
diff --git a/setup.py b/setup.py
index f379305..cf7b6ad 100644
--- a/setup.py
+++ b/setup.py
@@ -3,11 +3,11 @@ from distutils.core import setup, Extension
 module1 = Extension('_tkinter',
                     libraries=['tcl8.6', 'tk8.6'],
                     sources=['_tkinter.c'],
-                    include_dirs=['/app/include/'])
+                    include_dirs=['/app/include/', '/usr/include/python3.13/internal/'])
 
 setup(
     name='tkinter-standalone',
-    version='3.11',
+    version='3.13',
     description='Tkinter packaged as an external package for flatpak.',
     ext_modules=[module1],
     packages=["tkinter"]