https://bugs.gentoo.org/319789
http://git.gnome.org/browse/gegl/commit/?id=e287b94c8cb078db86d883395bd089002b405e18

--- a/gegl/buffer/gegl-buffer-save.c
+++ b/gegl/buffer/gegl-buffer-save.c
@@ -196,7 +196,7 @@ gegl_buffer_header_init (GeglBufferHeader *header,
                          gint              bpp,
                          Babl*             format)
 {
-  strcpy (header->magic, "GEGL");
+  memcpy (header->magic, "GEGL", 4);
 
   header->flags = GEGL_FLAG_HEADER;
   header->tile_width  = tile_width;