Undefined reference to `boost::system::system_category()

Description
After running cd build && cmake .. && make. It seems that the SearchService.ccp can't find the system_category function from the boost library.

To Reproduce
Steps to reproduce the behavior:

1. Installed Requirements
   Cmake : 3.17.3
   Swig : 3.0.8
   Boost : 1.67.0
2. Git Clone
3. Cd SPTAG
4. Mkdir Build
5. cd build && cmake .. && make

Result
[ 1%] Linking CXX executable ../../Release/server
CMakeFiles/server.dir/src/Server/SearchService.cpp.o:
In function SPTAG::Service::SearchService::~SearchService()': SearchService.cpp:(.text+0x25c): undefined reference to boost::system::system_category()'
SearchService.cpp:(.text+0x321): undefined reference to boost::system::system_category()' SearchService.cpp:(.text+0x364): undefined reference to boost::system::system_category()'
SearchService.cpp:(.text+0x41c): undefined reference to boost::system::system_category()' SearchService.cpp:(.text+0x44b): undefined reference to boost::system::system_category()'

Desktop

• OS: Ubuntu
• Version : 16.04

Reproduce the failure with the reported Ubuntu 16.04 steps: cd build && cmake .. && make. Start from the link step for the server target and inspect how SearchService.cpp is linked with Boost. Done means the server executable links successfully without undefined references to boost::system::system_category().