diff -urN SDL-1.2.13-orig/src/video/x11/SDL_x11gl.c SDL-1.2.13/src/video/x11/SDL_x11gl.c
--- SDL-1.2.13-orig/src/video/x11/SDL_x11gl.c	2007-12-31 13:48:13 +0900
+++ SDL-1.2.13/src/video/x11/SDL_x11gl.c	2009-06-11 04:33:40 +0900
@@ -308,6 +308,10 @@
 
 		glx_context = NULL;
 	}
+	if( glx_visualinfo ) {
+		XFree(glx_visualinfo);
+		glx_visualinfo = NULL;
+	}
 	gl_active = 0;
 #endif /* SDL_VIDEO_OPENGL_GLX */
 }