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diff --git a/source/3rd-party/SDL2/src/video/x11/SDL_x11opengles.h b/source/3rd-party/SDL2/src/video/x11/SDL_x11opengles.h
new file mode 100644
index 0000000..b189b76
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+++ b/source/3rd-party/SDL2/src/video/x11/SDL_x11opengles.h
@@ -0,0 +1,56 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_x11opengles_h_
+#define SDL_x11opengles_h_
+
+#if SDL_VIDEO_OPENGL_EGL
+
+#include "../SDL_sysvideo.h"
+#include "../SDL_egl_c.h"
+
+typedef struct SDL_PrivateGLESData
+{
+  /* 1401 If the struct-declaration-list contains no named members, the behavior is undefined. */
+  /* warning: empty struct has size 0 in C, size 1 in C++ [-Wc++-compat] */
+  int dummy; 
+} SDL_PrivateGLESData;
+
+/* OpenGLES functions */
+#define X11_GLES_GetAttribute SDL_EGL_GetAttribute
+#define X11_GLES_GetProcAddress SDL_EGL_GetProcAddress
+#define X11_GLES_UnloadLibrary SDL_EGL_UnloadLibrary
+#define X11_GLES_SetSwapInterval SDL_EGL_SetSwapInterval
+#define X11_GLES_GetSwapInterval SDL_EGL_GetSwapInterval
+#define X11_GLES_DeleteContext SDL_EGL_DeleteContext
+
+extern int X11_GLES_LoadLibrary(_THIS, const char *path);
+extern XVisualInfo *X11_GLES_GetVisual(_THIS, Display * display, int screen);
+extern SDL_GLContext X11_GLES_CreateContext(_THIS, SDL_Window * window);
+extern int X11_GLES_SwapWindow(_THIS, SDL_Window * window);
+extern int X11_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context);
+
+#endif /* SDL_VIDEO_OPENGL_EGL */
+
+#endif /* SDL_x11opengles_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */