Index: VirtualBox-6.0.4/include/VBox/VBoxGL2D.h
===================================================================
--- VirtualBox-6.0.4.orig/include/VBox/VBoxGL2D.h
+++ VirtualBox-6.0.4/include/VBox/VBoxGL2D.h
@@ -113,8 +113,10 @@ typedef GLvoid (APIENTRY *PFNVBOXVHWA_UN
 /* GL_ARB_pixel_buffer_object*/
 #ifndef Q_WS_MAC
 /* apears to be defined on mac */
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
 #endif
+#endif
 
 #ifndef GL_READ_ONLY
 # define GL_READ_ONLY                   0x88B8
Index: VirtualBox-6.0.4/include/VBox/HostServices/glext.h
===================================================================
--- VirtualBox-6.0.4.orig/include/VBox/HostServices/glext.h
+++ VirtualBox-6.0.4/include/VBox/HostServices/glext.h
@@ -3395,8 +3395,10 @@ typedef char GLchar;			/* native charact
 #ifndef GL_VERSION_1_5
 /* GL types for handling large vertex buffer objects */
 typedef ptrdiff_t GLintptr;
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
 #endif
+#endif
 
 #ifndef GL_ARB_vertex_buffer_object
 /* GL types for handling large vertex buffer objects */
Index: VirtualBox-6.0.4/src/VBox/Additions/3D/mesa/mesa-17.3.9/include/GL/glext.h
===================================================================
--- VirtualBox-6.0.4.orig/src/VBox/Additions/3D/mesa/mesa-17.3.9/include/GL/glext.h
+++ VirtualBox-6.0.4/src/VBox/Additions/3D/mesa/mesa-17.3.9/include/GL/glext.h
@@ -465,7 +465,9 @@ GLAPI void APIENTRY glBlendEquation (GLe
 #ifndef GL_VERSION_1_5
 #define GL_VERSION_1_5 1
 #include <stddef.h>
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
+#endif
 typedef ptrdiff_t GLintptr;
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765
Index: VirtualBox-6.0.4/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glcorearb.h
===================================================================
--- VirtualBox-6.0.4.orig/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glcorearb.h
+++ VirtualBox-6.0.4/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glcorearb.h
@@ -614,7 +614,9 @@ GLAPI void APIENTRY glBlendEquation (GLe
 #ifndef GL_VERSION_1_5
 #define GL_VERSION_1_5 1
 #include <stddef.h>
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
+#endif
 typedef ptrdiff_t GLintptr;
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765
Index: VirtualBox-6.0.4/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glext.h
===================================================================
--- VirtualBox-6.0.4.orig/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glext.h
+++ VirtualBox-6.0.4/src/VBox/Additions/x11/x11include/mesa-11.0.7/GL/glext.h
@@ -465,7 +465,9 @@ GLAPI void APIENTRY glBlendEquation (GLe
 #ifndef GL_VERSION_1_5
 #define GL_VERSION_1_5 1
 #include <stddef.h>
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
+#endif
 typedef ptrdiff_t GLintptr;
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765
Index: VirtualBox-6.0.4/src/VBox/Additions/x11/x11include/mesa-7.2/GL/glext.h
===================================================================
--- VirtualBox-6.0.4.orig/src/VBox/Additions/x11/x11include/mesa-7.2/GL/glext.h
+++ VirtualBox-6.0.4/src/VBox/Additions/x11/x11include/mesa-7.2/GL/glext.h
@@ -3708,8 +3708,10 @@ typedef char GLchar;			/* native charact
 #ifndef GL_VERSION_1_5
 /* GL types for handling large vertex buffer objects */
 typedef ptrdiff_t GLintptr;
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
 #endif
+#endif
 
 #ifndef GL_ARB_vertex_buffer_object
 /* GL types for handling large vertex buffer objects */
Index: VirtualBox-6.0.4/src/VBox/Devices/Graphics/vmsvga_glext/glext.h
===================================================================
--- VirtualBox-6.0.4.orig/src/VBox/Devices/Graphics/vmsvga_glext/glext.h
+++ VirtualBox-6.0.4/src/VBox/Devices/Graphics/vmsvga_glext/glext.h
@@ -6194,8 +6194,10 @@ typedef char GLchar;
 #ifndef GL_VERSION_1_5
 /* GL types for handling large vertex buffer objects */
 typedef ptrdiff_t GLintptr;
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
 #endif
+#endif
 
 #ifndef GL_ARB_vertex_buffer_object
 /* GL types for handling large vertex buffer objects */
Index: VirtualBox-6.0.4/src/VBox/GuestHost/OpenGL/include/GL/glext.h
===================================================================
--- VirtualBox-6.0.4.orig/src/VBox/GuestHost/OpenGL/include/GL/glext.h
+++ VirtualBox-6.0.4/src/VBox/GuestHost/OpenGL/include/GL/glext.h
@@ -3717,8 +3717,10 @@ typedef char GLchar;			/* native charact
 #ifndef GL_VERSION_1_5
 /* GL types for handling large vertex buffer objects */
 typedef ptrdiff_t GLintptr;
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
 #endif
+#endif
 
 #ifndef GL_ARB_vertex_buffer_object
 /* GL types for handling large vertex buffer objects */
Index: VirtualBox-6.0.4/src/VBox/GuestHost/OpenGL/include/chromium.h
===================================================================
--- VirtualBox-6.0.4.orig/src/VBox/GuestHost/OpenGL/include/chromium.h
+++ VirtualBox-6.0.4/src/VBox/GuestHost/OpenGL/include/chromium.h
@@ -499,7 +499,9 @@ PROC WINAPI wglGetProcAddress_prox( LPCS
 #ifndef GL_VERSION_1_5
 
 typedef ptrdiff_t GLintptr;
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
 typedef ptrdiff_t GLsizeiptr;
+#endif
 
 /* prototype these functions for opengl_stub/getprocaddress.c */
 extern void APIENTRY glGenQueries(GLsizei n, GLuint *ids);