add def guard

src/text.h

@@ -1,3 +1,6 @@
+#ifndef __TEXT_H__
+#define __TEXT_H__
+
 #include <SDL/SDL_ttf.h>
 #include "renderer.h"
 
@@ -11,3 +14,5 @@ typedef struct {
 int text_renderText(RenderObject_t* renderObject, Position position, SDL_Color color, const char* fontFilename, int fontSize, char* format, ...);
 
 void text_freeFontCache();
+
+#endif