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diff --git a/Source/external/SDL2/src/joystick/linux/SDL_sysjoystick_c.h b/Source/external/SDL2/src/joystick/linux/SDL_sysjoystick_c.h
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index 0000000..83d5937
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+++ b/Source/external/SDL2/src/joystick/linux/SDL_sysjoystick_c.h
@@ -0,0 +1,69 @@
+/*
+  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.
+*/
+
+#ifndef SDL_sysjoystick_c_h_
+#define SDL_sysjoystick_c_h_
+
+#include <linux/input.h>
+
+struct SDL_joylist_item;
+
+/* The private structure used to keep track of a joystick */
+struct joystick_hwdata
+{
+    int fd;
+    struct SDL_joylist_item *item;
+    SDL_JoystickGUID guid;
+    char *fname;                /* Used in haptic subsystem */
+
+    SDL_bool ff_rumble;
+    SDL_bool ff_sine;
+    struct ff_effect effect;
+
+    /* The current Linux joystick driver maps hats to two axes */
+    struct hwdata_hat
+    {
+        int axis[2];
+    } *hats;
+    /* The current Linux joystick driver maps balls to two axes */
+    struct hwdata_ball
+    {
+        int axis[2];
+    } *balls;
+
+    /* Support for the Linux 2.4 unified input interface */
+    Uint8 key_map[KEY_MAX];
+    Uint8 abs_map[ABS_MAX];
+    struct axis_correct
+    {
+        int used;
+        int coef[3];
+    } abs_correct[ABS_MAX];
+
+    int fresh;
+
+    /* Steam Controller support */
+    SDL_bool m_bSteamController;
+};
+
+#endif /* SDL_sysjoystick_c_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */