+# process embedded images
+if [ ! -f tools/img2bin/img2bin ]; then
+ make -C tools/img2bin || exit 1
+fi
+alias img2bin=tools/img2bin/img2bin
+
+mkdir -p data
+if [ ! -f data/loading.img -o data/loading.png -nt data/loading.img ]; then
+ echo 'img2bin: loading'
+ img2bin data/loading.png || exit 1
+fi
+
+# process compiled sprites