More splits from "tuxpaint.c":

+ "debug.h": Defines whether debugging printf() calls should be enabled.
  + "dirwalk.c/h": Callback functions for recursive directory traversal.
  + "fonts.c/h": Font loading/grouping/discarding variables and functions.
  + "get_fname.c/h": Functions for constructing preferred file paths.

src/pixels.c

@@ -29,6 +29,7 @@
 
 #include "pixels.h"
 #include "compiler.h"
+#include "debug.h"
 
 /* Draw a single pixel into the surface: */
 void putpixel8(SDL_Surface * surface, int x, int y, Uint32 pixel)