I would like to monitor the FS on my Galaxy S8 phone. I am using Ubuntu 18.04.2 LTS with adb to connect to my samsung. In my Ubuntu environment, i entered the following command:
make android NDK_ARCH=arm64 ANDROID_API=26

I then received the following response:

for a in arm84; do \
if [ -z ""]; then \
./android-shell.sh $a \
make aagt21compile ANDROID_API=26 NDK_ARCH=$a ; \
else \
make aagt21compile ANDROID_API=26 NDK_ARCH=$a ; \
fi ; \
done
Building android locally with NDK instead of dockcross......
Invalid path in NDK environment, please change me.
Makefile:166: recipe for target 'android' failed
make: *** [android] Error 1

I am unable to take a screenshot of the error as my ubuntu computer doesn't have internet and I am quite restricted at my workplace in terms of transferring stuff from development to internet laptop.

Please help!