Source: https://gitlab.alpinelinux.org/alpine/aports/-/blob/48a858e7ec54d7c3dceeb520883e4a5f36b4f284/main/perl-tk/gcc14.patch

--- config/signedchar.c
+++ ./config/signedchar.c	
@@ -1,4 +1,4 @@ 
-main()
+int main()
 {
  signed char x = 'a';
  return (x - 'a');
--- config/unsigned.c	
+++ ./config/unsigned.c	
@@ -1,3 +1,5 @@ 
+#include <stdlib.h>
+
 int main()
 {
  char x[] = "\377";
--- pTk/config/Hstrdup.c	
+++ ./pTk/config/Hstrdup.c	
@@ -1,4 +1,5 @@ 
 #include <string.h>
+#include <stdlib.h>
 
 #define STRING "Whatever"
 
--- pTk/config/Hstrtoul.c	
+++ ./pTk/config/Hstrtoul.c	
@@ -1,3 +1,4 @@ 
+#include <string.h>
 #include <stdlib.h>
 
 int main()
--- pTk/mTk/generic/tkEvent.c	
+++ ./pTk/mTk/generic/tkEvent.c	
@@ -1153,6 +1153,7 @@ TkEventDeadWindow(winPtr)
 Time
 TkCurrentTime(dispPtr, fallbackCurrent)
     TkDisplay *dispPtr;		/* Display for which the time is desired. */
+    int fallbackCurrent;
 {
     register XEvent *eventPtr;
     ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
--- pTk/mTk/generic/tkImage.c	
+++ ./pTk/mTk/generic/tkImage.c	
@@ -1083,6 +1083,8 @@ int x;
 int y;
 int width;
 int height;
+int imgWidth;
+int imgHeight;
 {
     Tk_Tile tile = (Tk_Tile) clientData;
     Tk_TileChange *handler;
--- Event/Event.xs	
+++ ./Event/Event.xs	
@@ -1532,7 +1532,7 @@ PROTOTYPES: DISABLE
 BOOT:
  {
 #ifdef pWARN_NONE
-  SV *old_warn = PL_curcop->cop_warnings;
+  char *old_warn = PL_curcop->cop_warnings;
   PL_curcop->cop_warnings = pWARN_NONE;
 #endif
   newXS("Tk::Event::INIT", XS_Tk__Event_INIT, file);
--- config/pregcomp2.c	
+++ ./config/pregcomp2.c	
@@ -4,5 +4,5 @@ 
 
 int main() {
     SV* sv = newSViv(0);
-    regexp* rx = pregcomp(sv, 0);
+    void *rx = (void *) pregcomp(sv, 0);
 }
--- pTk/Xlib.t	
+++ ./pTk/Xlib.t	
@@ -331,7 +331,7 @@ VFUNC(int,XIntersectRegion,V_XIntersectR
 #endif /* !DO_X_EXCLUDE */
 
 #ifndef XKeycodeToKeysym
-VFUNC(KeySym,XKeycodeToKeysym,V_XKeycodeToKeysym,_ANSI_ARGS_((Display *, unsigned int, int)))
+VFUNC(KeySym,XKeycodeToKeysym,V_XKeycodeToKeysym,_ANSI_ARGS_((Display *, unsigned char, int)))
 #endif /* #ifndef XKeycodeToKeysym */
 
 #ifndef XKeysymToString
--- pTk/mTk/generic/tkCanvText.c	
+++ ./pTk/mTk/generic/tkCanvText.c	
@@ -1250,7 +1250,7 @@ GetTextIndex(interp, canvas, itemPtr, ob
 	goto doxy;
     }
 
-    string = Tcl_GetStringFromObj(obj, &length);
+    string = Tcl_GetStringFromObj(obj, NULL);
     c = string[0];
     length = strlen(string);
 
--- tkGlue.c	
+++ ./tkGlue.c	
@@ -5549,7 +5549,7 @@ _((pTHX))
 #define COP_WARNINGS_TYPE SV*
 #endif
 #ifdef pWARN_NONE
- COP_WARNINGS_TYPE old_warn = PL_curcop->cop_warnings;
+ char *old_warn = PL_curcop->cop_warnings;
  PL_curcop->cop_warnings = pWARN_NONE;
 #endif
 
From 061e4744c01dd2ed461fd0009cb1699c4f37f131 Mon Sep 17 00:00:00 2001
From: Randy Eckenrode <randy@largeandhighquality.com>
Date: Thu, 7 Sep 2023 05:17:32 +0200
Subject: [PATCH 1/2] jpeg: fix build with clang 16

The jpeg `configure` script fails to detect clang as a functioning C
compiler because it uses a test with a `main` that returns an implicit
`int`, which results in an error with clang 16.
---
 JPEG/jpeg/configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/JPEG/jpeg/configure b/JPEG/jpeg/configure
index 35c9db5c..ce76b557 100755
--- a/JPEG/jpeg/configure
+++ b/JPEG/jpeg/configure
@@ -623,7 +623,7 @@ cross_compiling=$ac_cv_prog_cc_cross
 cat > conftest.$ac_ext <<EOF
 #line 625 "configure"
 #include "confdefs.h"
-main(){return(0);}
+int main(){return(0);}
 EOF
 if { (eval echo configure:629: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
   ac_cv_prog_cc_works=yes

From 3c5126df9b06bd6c87211d762b081cc801368fa5 Mon Sep 17 00:00:00 2001
From: Christopher Chavez <chrischavez@gmx.us>
Date: Thu, 14 Sep 2023 06:27:52 -0500
Subject: [PATCH 2/2] jpeg: more fixes for clang 16

---
 JPEG/jpeg/configure | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/JPEG/jpeg/configure b/JPEG/jpeg/configure
index ce76b557..c5593f2f 100755
--- a/JPEG/jpeg/configure
+++ b/JPEG/jpeg/configure
@@ -1281,6 +1281,10 @@ else
 #line 1282 "configure"
 #include "confdefs.h"
 
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
 #ifdef HAVE_PROTOTYPES
 int is_char_signed (int arg)
 #else
@@ -1298,7 +1302,7 @@ int is_char_signed (arg)
   return 1;			/* assume char is signed otherwise */
 }
 char signed_char_check = (char) (-67);
-main() {
+int main() {
   exit(is_char_signed((int) signed_char_check));
 }
 EOF
@@ -1327,6 +1331,10 @@ else
 #line 1328 "configure"
 #include "confdefs.h"
 
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
 #ifdef HAVE_PROTOTYPES
 int is_shifting_signed (long arg)
 #else
@@ -1350,7 +1358,7 @@ int is_shifting_signed (arg)
   printf("I fear the JPEG software will not work at all.\n\n");
   return 0;			/* try it with unsigned anyway */
 }
-main() {
+int main() {
   exit(is_shifting_signed(-0x7F7E80B1L));
 }
 EOF
@@ -1380,7 +1388,10 @@ else
 #include "confdefs.h"
 
 #include <stdio.h>
-main() {
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+int main() {
   if (fopen("conftestdata", "wb") != NULL)
     exit(0);
   exit(1);