Fixed bug 3010 - SDL_x11messagebox.c needs including X11/keysym.h Ozkan Sezer SDL_x11messagebox.c needs including <X11/keysym.h> otherwise XK_Escape, etc might not be available to it. Seen this with x.org-x11-6.8.2.
diff --git a/src/video/x11/SDL_x11messagebox.c b/src/video/x11/SDL_x11messagebox.c
index 2d34e9e..7c3aaec 100644
--- a/src/video/x11/SDL_x11messagebox.c
+++ b/src/video/x11/SDL_x11messagebox.c
@@ -28,6 +28,7 @@
#include "SDL_x11dyn.h"
#include "SDL_assert.h"
+#include <X11/keysym.h>
#include <locale.h>