- fix local-files target at very first start

Makefile

@@ -7,7 +7,8 @@ warn:
 	@echo "Refusing to build. Good bye."
 else
 
-local-files:
+# workaround unset variables at first start
+local-files: $(eval BOXMODEL = nevis)
 	@test -e config.local || cp config.example config.local
 	@touch Makefile.local
 	@mkdir -p local/root

README.md

@@ -28,7 +28,7 @@ ln -s $HOME/src/Archive download
 # 3) Buildsystem konfigurieren #
 ```
 #!bash
-make local-files BOXSERIES=hd2
+make local-files
 ```
 config.local auf die eigenen Bedürfnisse anpassen