message: Get Boost location from env var
diff: @@ -101,12 +101,14 @@ QMAKE_CXXFLAGS += -std=c++17 -mmacosx-version-min=10.10 -isysroot
  #brew install boost
  - _BOOST_PATH = /usr/local/Cellar/boost/1.68.0_1
  - INCLUDEPATH += "$${_BOOST_PATH}/include/"
  - LIBS += -L$${_BOOST_PATH}/lib
  + # $BOOST_PATH is set via environment
  +# _BOOST_PATH = /usr/local/Cellar/boost/1.68.0_1
  +# BOOST_PATH = /usr/local/Cellar/boost/1.68.0_1
  + INCLUDEPATH += "$${BOOST_PATH}/include/"
  + LIBS += -L$${BOOST_PATH}/lib
  LIBS += -lboost_system-mt -lboost_chrono-mt -lboost_filesystem-mt -lboost_program_options-mt -lboost_thread-mt -lboost_unit_test_framework-mt -lboost_timer-mt # using dynamic lib (not sure if you need that "-mt" at the end or not)
  DEFINES += BOOST_ASIO_ENABLE_OLD_SERVICES BOOST_SPIRIT_THREADSAFE BOOST_THREAD_USE_LIB BOOST_THREAD_POSIX BOOST_HAS_THREADS
  - #LIBS += $${_BOOST_PATH}/lib/libboost_chrono-mt.a # using static lib
  + #LIBS += $${BOOST_PATH}/lib/libboost_chrono-mt.a # using static lib
  #brew install openssl@1.1
  # $OPENSSL_PATH is set via environment
  