diff --git a/Dockerfile b/Dockerfile
index a9dccc9..7caf424 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,6 +19,7 @@ ENV JAVA_HOME="/usr/lib/jvm/java-11-openjdk/"
 #ENTRYPOINT bash -c 'sleep 10000'
 ENV LIBRARY_PATH="$LIBRARY_PATH:$BUILD_TOOLS_LATEST/lib"
 ARG YESACCEPT=n
+RUN test "$YESACCEPT" = "y" || { printf "\033[31;1;4m%s\n%s\033[0m " "FAILED TO BUILD CONTAINER: You did not ACCEPT THE UPSTREAM LICENSE" " -> export YESACCEPT=y" >&2; exit 1; }
 RUN echo you selected to accept the licenses/TOS 
 RUN echo "$YESACCEPT" | sdkmanager --install "build-tools;33.0.2"
 RUN echo "$YESACCEPT" | sdkmanager --install "platforms;android-33"
diff --git a/Makefile b/Makefile
index 04e859f..0832ed8 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ all: build install
 
 build:
 	docker-compose run --rm compile 
-	ln -sv apk/bin/example.app.apk ./
+	ln -sf apk/bin/example.app.apk ./; test -e ./example.app.apk || rm ./example.app.apk 
 
 install: 
 	adb install -r ./example.app.apk