/home/saint/Development/Rockbox/rockbox/apps/gui/skin_engine/skin_engine.c: In function ‘gui_sync_skin_init’:
/home/saint/Development/Rockbox/rockbox/apps/gui/skin_engine/skin_engine.c:136:33: error: ‘struct wps_data’ has no member named ‘backdrop_id’
             if (skins[j][i].data.backdrop_id != -1)
                                 ^
/home/saint/Development/Rockbox/rockbox/apps/gui/skin_engine/skin_engine.c:137:54: error: ‘struct wps_data’ has no member named ‘backdrop_id’
                 skin_backdrop_unload(skins[j][i].data.backdrop_id);
                                                      ^
make: *** [/home/saint/Development/Rockbox/clip_sim/apps/gui/skin_engine/skin_engine.o] Error 1