if (NOT __ZMQ_INCLUDED) # guard against multiple includes
  set(__ZMQ_INCLUDED TRUE)

  # use the system-wide ZMQ if present
  find_package(ZMQ)
  if (ZMQ_FOUND)
    set(ZMQ_EXTERNAL FALSE)
  else()
    # ZMQ will use pthreads if it's available in the system, so we must link with it
    find_package(Threads)

    # build directory
    set(ZMQ_PREFIX ${CMAKE_BINARY_DIR}/external/ZMQ-prefix)
    # install directory
    set(ZMQ_INSTALL ${CMAKE_BINARY_DIR}/external/ZMQ-install)

    # we build ZMQ statically, but want to link it into the caffe shared library
    # this requires position-independent code
    if (UNIX)
        set(ZMQ_EXTRA_COMPILER_FLAGS "-fPIC")
    endif()

    set(ZMQ_CXX_FLAGS ${CMAKE_CXX_FLAGS} ${ZMQ_EXTRA_COMPILER_FLAGS})
    set(ZMQ_C_FLAGS ${CMAKE_C_FLAGS} ${ZMQ_EXTRA_COMPILER_FLAGS})

    ExternalProject_Add(ZMQ
      PREFIX ${ZMQ_PREFIX}
      GIT_REPOSITORY "https://github.com/zeromq/libZMQ.git"
      UPDATE_COMMAND ""
      INSTALL_DIR ${ZMQ_INSTALL}
      CMAKE_ARGS -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
                 -DCMAKE_INSTALL_PREFIX=${ZMQ_INSTALL}
                 -DBUILD_SHARED_LIBS=OFF
                 -DBUILD_STATIC_LIBS=ON
                 -DBUILD_PACKAGING=OFF
                 -DBUILD_TESTING=OFF
                 -DBUILD_NC_TESTS=OFF
                 -BUILD_CONFIG_TESTS=OFF
                 -DINSTALL_HEADERS=ON
                 -DCMAKE_C_FLAGS=${ZMQ_C_FLAGS}
                 -DCMAKE_CXX_FLAGS=${ZMQ_CXX_FLAGS}
      LOG_DOWNLOAD 1
      LOG_INSTALL 1
      )

    set(ZMQ_FOUND TRUE)
    set(ZMQ_INCLUDE_DIRS ${ZMQ_INSTALL}/include)
	
	if(MSVC)
		FILE(GLOB_RECURSE ZMQ_LIBRARIES "${ZMQ_INSTALL}/lib/libzmq-${CMAKE_VS_PLATFORM_TOOLSET}*.lib")
		#set(ZMQ_LIBRARIES ${ZMQ_INSTALL}/lib/ZMQ.lib ${CMAKE_THREAD_LIBS_INIT})
	else()
		FILE(GLOB_RECURSE ZMQ_LIBRARIES "${ZMQ_INSTALL}/lib/libzmq-*.a")
		#set(ZMQ_LIBRARIES ${ZMQ_INSTALL}/lib/libZMQ.a ${CMAKE_THREAD_LIBS_INIT})
	endif()
    set(ZMQ_LIBRARY_DIRS ${ZMQ_INSTALL}/lib)
    set(ZMQ_EXTERNAL TRUE)

    list(APPEND external_project_dependencies ZMQ)
  endif()

endif()