Index: VirtualBox-6.1.2/include/VBox/VBoxGL2D.h
===================================================================
--- VirtualBox-6.1.2.orig/include/VBox/VBoxGL2D.h
+++ VirtualBox-6.1.2/include/VBox/VBoxGL2D.h
@@ -113,7 +113,7 @@ typedef GLvoid (APIENTRY *PFNVBOXVHWA_UN
 /* GL_ARB_pixel_buffer_object*/
 #ifndef Q_WS_MAC
 /* apears to be defined on mac */
-typedef ptrdiff_t GLsizeiptr;
+typedef long int GLsizeiptr;
 #endif
 
 #ifndef GL_READ_ONLY
Index: VirtualBox-6.1.2/src/VBox/Additions/3D/mesa/mesa-17.3.9/include/GL/glext.h
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/3D/mesa/mesa-17.3.9/include/GL/glext.h
+++ VirtualBox-6.1.2/src/VBox/Additions/3D/mesa/mesa-17.3.9/include/GL/glext.h
@@ -465,7 +465,12 @@ GLAPI void APIENTRY glBlendEquation (GLe
 #ifndef GL_VERSION_1_5
 #define GL_VERSION_1_5 1
 #include <stddef.h>
+#include <QtCore/qglobal.h>
+#if __BITS_PER_LONG != 64
 typedef ptrdiff_t GLsizeiptr;
+#else
+typedef long int GLsizeiptr;
+#endif
 typedef ptrdiff_t GLintptr;
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765
Index: VirtualBox-6.1.2/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glcorearb.h
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glcorearb.h
+++ VirtualBox-6.1.2/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glcorearb.h
@@ -614,7 +614,11 @@ GLAPI void APIENTRY glBlendEquation (GLe
 #ifndef GL_VERSION_1_5
 #define GL_VERSION_1_5 1
 #include <stddef.h>
+#if __BITS_PER_LONG != 64
 typedef ptrdiff_t GLsizeiptr;
+#else
+typedef long int GLsizeiptr;
+#endif
 typedef ptrdiff_t GLintptr;
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765
Index: VirtualBox-6.1.2/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glext.h
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glext.h
+++ VirtualBox-6.1.2/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glext.h
@@ -465,7 +465,11 @@ GLAPI void APIENTRY glBlendEquation (GLe
 #ifndef GL_VERSION_1_5
 #define GL_VERSION_1_5 1
 #include <stddef.h>
+#if __BITS_PER_LONG != 64
 typedef ptrdiff_t GLsizeiptr;
+#else
+typedef long int GLsizeiptr;
+#endif
 typedef ptrdiff_t GLintptr;
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765
Index: VirtualBox-6.1.2/src/VBox/Additions/x11/x11include/mesa-7.2/GL/glext.h
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/x11/x11include/mesa-7.2/GL/glext.h
+++ VirtualBox-6.1.2/src/VBox/Additions/x11/x11include/mesa-7.2/GL/glext.h
@@ -3708,7 +3708,11 @@ typedef char GLchar;			/* native charact
 #ifndef GL_VERSION_1_5
 /* GL types for handling large vertex buffer objects */
 typedef ptrdiff_t GLintptr;
+#if __BITS_PER_LONG != 64
 typedef ptrdiff_t GLsizeiptr;
+#else
+typedef long int GLsizeiptr;
+#endif
 #endif
 
 #ifndef GL_ARB_vertex_buffer_object
Index: VirtualBox-6.1.2/src/VBox/Devices/Graphics/vmsvga_glext/glext.h
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Devices/Graphics/vmsvga_glext/glext.h
+++ VirtualBox-6.1.2/src/VBox/Devices/Graphics/vmsvga_glext/glext.h
@@ -6194,7 +6194,11 @@ typedef char GLchar;
 #ifndef GL_VERSION_1_5
 /* GL types for handling large vertex buffer objects */
 typedef ptrdiff_t GLintptr;
+#if __BITS_PER_LONG != 64
 typedef ptrdiff_t GLsizeiptr;
+#else
+typedef long int GLsizeiptr;
+#endif
 #endif
 
 #ifndef GL_ARB_vertex_buffer_object