1. download the protocol buffer source package, e.g. protobuf-3.8.0.tar.gz 
2. trim the package by removing unnecessary modules(e.g java,python) to meet the size limit of bioconductor
	remove these modules from their subfolders 
	and references from 
	./Makefile.am 
	src/Makefile.am 
	src/google/protobuf/compiler/main.cc
3. run autogen.sh to generate configure files (require libtool to be installed)
4. Make sure to rm .github folder from source folder
4. tar -czvf protobuf-3.8.0.tar.gz protobuf-3.8.0/
