diff -u -r SDL2-2.0.10.orig/include/SDL_opengl_glext.h SDL2-2.0.10/include/SDL_opengl_glext.h
--- SDL2-2.0.10.orig/include/SDL_opengl_glext.h	2019-10-09 15:30:46.237981000 +0200
+++ SDL2-2.0.10/include/SDL_opengl_glext.h	2019-10-09 15:31:37.783940000 +0200
@@ -469,8 +469,9 @@
 typedef long GLsizeiptr;
 typedef long GLintptr;
 #else
-typedef ptrdiff_t GLsizeiptr;
-typedef ptrdiff_t GLintptr;
+#include <KHR/khrplatform.h>
+typedef khronos_ssize_t GLsizeiptr;
+typedef khronos_intptr_t GLintptr;
 #endif
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765