How to assign protobuf location when building on ubuntu?

[skyday123]

I have built a protobuf 3.6.1 library and add the directory to LD_LIBRARY_PATH and LIBRARY_PATH. After make, I check the link of libtengine.so by ldd, it shows:
libprotobuf.so.8 => /usr/lib64/libprotobuf.so.8
So does the Makefile assigned the location of protobuf explicitly? I checked the Makefile and the only related code is -lprotobuf thus my protobuf should be linked first?

[hey-yahei]

Hi, @skyday123
GCC would select the first one when it searches libraries. Please echo $LD_LIBRARY_PATH and echo LIBRARY_PATH to check if your path to protobuf 3.6.1 is at the first field in variable LD_LIBRARY_PATH and LIBRARY_PATH.
Thanks