MODULE.TARGET.SHARED_LIBRARIES.libjpeg already defined error

The error states that the Shared object libjpeg is already defined in other module google/libs and you are again trying to create it. So just try to rename the Android.mk file in google/libs folder or in external/jpeg folder. It fixes the issue.

I had encountered your error but the solution was not to change any Makefile or source. Simply I had forgotten to run environment setup script(in may AOSP tree: build/envsetup.sh) After running that, no error happens.