https://github.com/eserte/perl-tk/pull/48
https://github.com/eserte/perl-tk/pull/89

From e7c5041b4fff6210bc0348c72b538efae32aede3 Mon Sep 17 00:00:00 2001
From: Karl Williamson <khw@cpan.org>
Date: Thu, 28 Mar 2019 22:59:17 -0500
Subject: [PATCH 1/3] Fix segfaults due to parameter size mismatch

See: https://rt.cpan.org/Ticket/Display.html?id=128955
As also done upstream: https://core.tcl-lang.org/tk/info/0d9c0d50f9
--- a/pTk/mTk/generic/tkCanvText.c
+++ b/pTk/mTk/generic/tkCanvText.c
@@ -1234,8 +1234,7 @@ GetTextIndex(interp, canvas, itemPtr, obj, indexPtr)
 				 * index. */
 {
     TextItem *textPtr = (TextItem *) itemPtr;
-    size_t length;
-    int c;
+    int c, length;
     TkCanvas *canvasPtr = (TkCanvas *) canvas;
     Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
     char *string;
--- a/pTk/mTk/generic/tkFrame.c
+++ b/pTk/mTk/generic/tkFrame.c
@@ -493,8 +493,7 @@ CreateFrame(clientData, interp, objc, objv, type, appName)
     CONST char *className, *screenName, *colormapName, *arg;
     Tcl_Obj *visualName;
     Tcl_Obj *useOption;
-    int i, c, depth;
-    size_t length;
+    int i, c, depth, length;
     unsigned int mask;
     Colormap colormap;
     Visual *visual;
@@ -749,8 +748,7 @@ FrameWidgetObjCmd(clientData, interp, objc, objv)
     };
     register Frame *framePtr = (Frame *) clientData;
     int result = TCL_OK, index;
-    size_t length;
-    int c, i;
+    int c, i, length;
     Tcl_Obj *objPtr;
 
     if (objc < 2) {

From 2bba8c45fcbcd9f3d45b7bc5f290e324d7c01a13 Mon Sep 17 00:00:00 2001
From: Christopher Chavez <chrischavez@gmx.us>
Date: Fri, 12 Feb 2021 11:28:48 -0600
Subject: [PATCH 2/3] tkFrame.c: remove redundant casts

--- a/pTk/mTk/generic/tkFrame.c
+++ b/pTk/mTk/generic/tkFrame.c
@@ -522,7 +522,7 @@ CreateFrame(clientData, interp, objc, objv, type, appName)
     visualName = NULL;
     colormap = None;
     for (i = 2; i < objc; i += 2) {
-	arg = Tcl_GetStringFromObj(objv[i], (int *) &length);
+	arg = Tcl_GetStringFromObj(objv[i], &length);
 	if (length < 2) {
 	    continue;
 	}
@@ -796,7 +796,7 @@ FrameWidgetObjCmd(clientData, interp, objc, objv)
 	     */
 
 	    for (i = 2; i < objc; i++) {
-		char *arg = Tcl_GetStringFromObj(objv[i], (int *) &length);
+		char *arg = Tcl_GetStringFromObj(objv[i], &length);
 		if (length < 2) {
 		    continue;
 		}

From 3dd0956e92df84ec0e788368ff0214e527d28dd8 Mon Sep 17 00:00:00 2001
From: Christopher Chavez <chrischavez@gmx.us>
Date: Fri, 12 Feb 2021 11:29:16 -0600
Subject: [PATCH 3/3] tkImgPhoto.c: fix instances of RT #128955

Remove unnecessary casts to (int *)
As done upstream: https://core.tcl-lang.org/tk/info/0d9c0d50f9
--- a/pTk/mTk/generic/tkImgPhoto.c
+++ b/pTk/mTk/generic/tkImgPhoto.c
@@ -676,10 +676,9 @@ ImgPhotoCmd(clientData, interp, objc, objv)
     XColor color;
     Tk_PhotoImageFormat *imageFormat;
     int imageWidth, imageHeight;
-    int matched;
+    int length, matched;
     Tcl_Channel chan;
     Tk_PhotoHandle srcHandle;
-    size_t length;
     Tcl_Obj *obj;
     int c;
     ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
@@ -723,7 +722,7 @@ ImgPhotoCmd(clientData, interp, objc, objv)
 	    Tcl_WrongNumArgs(interp, 2, objv, "option");
 	    return TCL_ERROR;
 	}
-	arg = Tcl_GetStringFromObj(objv[2], (int *) &length);
+	arg = Tcl_GetStringFromObj(objv[2], &length);
 	if (strncmp(arg,"-data", length) == 0) {
 	    if (masterPtr->dataString) {
 		Tcl_SetObjResult(interp, masterPtr->dataString);
@@ -768,7 +767,7 @@ ImgPhotoCmd(clientData, interp, objc, objv)
 	    return TCL_OK;
 	}
 	if (objc == 3) {
-	    char *arg = Tcl_GetStringFromObj(objv[2], (int *) &length);
+	    char *arg = Tcl_GetStringFromObj(objv[2], &length);
 	    if (!strncmp(arg, "-data", length)) {
 		Tcl_Obj *subobj = Tcl_NewStringObj("-data {} {} {}", 14);
 		if (masterPtr->dataString) {
@@ -5753,8 +5752,8 @@ PhotoOptionFind(interp, obj)
     Tcl_Interp *interp;         /* Interpreter that is being deleted. */
     Tcl_Obj *obj;                       /* Name of option to be found. */
 {
-    size_t length;
-    char *name = Tcl_GetStringFromObj(obj, (int *) &length);
+    int length;
+    char *name = Tcl_GetStringFromObj(obj, &length);
     OptionAssocData *list;
     char *prevname = NULL;
     Tcl_ObjCmdProc *proc = (Tcl_ObjCmdProc *) NULL;

From 0cc1fd7c599fc6b7050fcd7442f10824b032c462 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Thu, 3 Jan 2019 20:53:24 +0000
Subject: [PATCH] Fix for conflicting symbols in X.h and Windows.h

Backported from Tcl/Tk 8.6.10:
see https://core.tcl-lang.org/tk/info/9e31fd944934

Fixes #87
--- a/pTk/mTk/xlib/X11/X.h
+++ b/pTk/mTk/xlib/X11/X.h
@@ -73,7 +73,9 @@ typedef unsigned long KeyCode;	/* In order to use IME, the Macintosh needs
  * RESERVED RESOURCE AND CONSTANT DEFINITIONS
  *****************************************************************/
 
-#define None                 0L	/* universal null resource or null atom */
+#ifndef _WIN32
+#   define None              0L      /* See bug [9e31fd9449] and below */
+#endif
 
 #define ParentRelative       1L	/* background pixmap in CreateWindow
 				    and ChangeWindowAttributes */
@@ -179,13 +181,20 @@ are reserved in the protocol for errors and replies. */
 
 #define ShiftMask		(1<<0)
 #define LockMask		(1<<1)
-#define ControlMask		(1<<2)
+#ifndef _WIN32
+#   define ControlMask		(1<<2) /* See bug [9e31fd9449] and below */
+#endif
 #define Mod1Mask		(1<<3)
 #define Mod2Mask		(1<<4)
 #define Mod3Mask		(1<<5)
 #define Mod4Mask		(1<<6)
 #define Mod5Mask		(1<<7)
 
+/* See bug [9e31fd9449], this way prevents conflicts with Win32 headers */
+#ifdef _WIN32
+enum _Bug9e31fd9449 { None = 0, ControlMask = (1<<2) };
+#endif
+
 /* modifier names.  Used to build a SetModifierMapping request or
    to read a GetModifierMapping request.  These correspond to the
    masks defined above. */