--- qt-everywhere-src-6.9.3.old/qtbase/src/gui/opengl/qopenglext.h
+++ qt-everywhere-src-6.9.3/qtbase/src/gui/opengl/qopenglext.h
@@ -474,8 +474,8 @@
 typedef signed long long int GLsizeiptr;
 typedef signed long long int GLintptr;
 #else
-typedef signed long int      GLsizeiptr;
-typedef signed long int      GLintptr;
+typedef ptrdiff_t GLsizeiptr;
+typedef ptrdiff_t GLintptr;
 #endif
 
 #define GL_BUFFER_SIZE                    0x8764
--- qt-everywhere-src-6.9.3.old/qtwebengine/src/3rdparty/chromium/gpu/command_buffer/common/gl2_types.h
+++ qt-everywhere-src-6.9.3/qtwebengine/src/3rdparty/chromium/gpu/command_buffer/common/gl2_types.h
@@ -6,6 +6,7 @@
 #define GPU_COMMAND_BUFFER_COMMON_GL2_TYPES_H_
 
 #include <KHR/khrplatform.h>
+#include <cstddef>
 
 // GL types are forward declared to avoid including the GL headers. The problem
 // is determining which GL headers to include from code that is common to the
--- qt-everywhere-src-6.9.3.old/qtwebengine/src/3rdparty/chromium/ppapi/c/ppb_opengles2.h
+++ qt-everywhere-src-6.9.3/qtwebengine/src/3rdparty/chromium/ppapi/c/ppb_opengles2.h
@@ -7,6 +7,7 @@
 #ifndef PPAPI_C_PPB_OPENGLES2_H_
 #define PPAPI_C_PPB_OPENGLES2_H_
 
+#include <cstddef>
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
--- qt-everywhere-src-6.9.3.old/qtwebengine/src/3rdparty/chromium/third_party/angle/src/libANGLE/renderer/gl/functionsgl_typedefs.h
+++ qt-everywhere-src-6.9.3/qtwebengine/src/3rdparty/chromium/third_party/angle/src/libANGLE/renderer/gl/functionsgl_typedefs.h
@@ -11,6 +11,7 @@
 
 #include "common/platform.h"
 
+#include <cstddef>
 #include <KHR/khrplatform.h>
 #include <stdint.h>
 
==== end of patch ====