https://src.fedoraproject.org/rpms/SDL2/c/7f8287c2b26a23d35ba19d69c00bd036314495c7

From 7f8287c2b26a23d35ba19d69c00bd036314495c7 Mon Sep 17 00:00:00 2001
From: Tom Callaway <spot@fedoraproject.org>
Date: Fri, 15 Feb 2019 20:27:21 -0500
Subject: [PATCH] use khrplatform defines, not ptrdiff_t

---
 SDL2/include/SDL_opengl_glext.h | 5 +++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff -up SDL2-2.0.9/include/SDL_opengl_glext.h.khrplatform SDL2-2.0.9/include/SDL_opengl_glext.h
--- SDL2-2.0.9/include/SDL_opengl_glext.h.khrplatform	2019-02-15 20:22:39.173773779 -0500
+++ SDL2-2.0.9/include/SDL_opengl_glext.h	2019-02-15 20:22:58.176399330 -0500
@@ -469,8 +469,9 @@ GLAPI void APIENTRY glBlendEquation (GLe
 typedef long GLsizeiptr;
 typedef long GLintptr;
 #else
-typedef ptrdiff_t GLsizeiptr;
-typedef ptrdiff_t GLintptr;
+#include <KHR/khrplatform.h>
+typedef khronos_intptr_t GLintptr;
+typedef khronos_ssize_t GLsizeiptr;
 #endif
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765