diff --git a/3rdparty/khronos/gl/glext.h b/3rdparty/khronos/gl/glext.h
index e7026644..735e3a73 100644
--- a/3rdparty/khronos/gl/glext.h
+++ b/3rdparty/khronos/gl/glext.h
@@ -465,8 +465,13 @@ GLAPI void APIENTRY glBlendEquation (GLenum mode);
 #ifndef GL_VERSION_1_5
 #define GL_VERSION_1_5 1
 #include <stddef.h>
+#if defined(__APPLE__) && defined(__i386__)
+typedef long GLsizeiptr;
+typedef long GLintptr;
+#else
 typedef ptrdiff_t GLsizeiptr;
 typedef ptrdiff_t GLintptr;
+#endif
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765
 #define GL_QUERY_COUNTER_BITS             0x8864
@@ -4130,8 +4135,13 @@ GLAPI void APIENTRY glVertexBlendARB (GLint count);
 
 #ifndef GL_ARB_vertex_buffer_object
 #define GL_ARB_vertex_buffer_object 1
+#if defined(__APPLE__) && defined(__i386__)
+typedef long GLsizeiptrARB;
+typedef long GLintptrARB;
+#else
 typedef ptrdiff_t GLsizeiptrARB;
 typedef ptrdiff_t GLintptrARB;
+#endif
 #define GL_BUFFER_SIZE_ARB                0x8764
 #define GL_BUFFER_USAGE_ARB               0x8765
 #define GL_ARRAY_BUFFER_ARB               0x8892