Could not find boost_thread library

[filitchp]

On my system (OS X 10.11.6 with Boost 1.65) I kept getting the linker error "ld: library not found for -lboost_thread".

SIMPLE FIX: in CMakelists.txt change boost_thread to boost_thread-mt like so:

target_link_libraries(ecto_streamer_serv
  ${OpenCV_LIBS}
  boost_thread-mt boost_system boost_regex
  )

I'm not sure if the fix is good for maintaining backwards compatibility with older versions of Boost or if this is perhaps a system-dependent issue, but it allowed me to run the sample server.