PkgConfig is (may be) used by the build system but not listed as dependency

[dvstans]

I'm not sure why PkgConfig is needed in the cmake build file. Need to determine if it really is needed and either document it, or remove it if it isn't needed.

[JoshuaSBrown]

It looks like I added that, it was necessary when ZeroMQ did not support fully the CMake package configuration files. Now they do, I think it can be removed and replaced, i.e. these lines can be changed I believe:

  ## load in pkg-config support
  find_package(PkgConfig)
  ## use pkg-config to get hints for 0mq locations
  pkg_check_modules(PC_ZeroMQ QUIET zmq)

  ## use the hint from above to find where 'zmq.h' is located
  find_path(ZeroMQ_INCLUDE_DIR
          NAMES zmq.h
          PATHS ${PC_ZeroMQ_INCLUDE_DIRS}
          )

  ## use the hint from about to find the location of libzmq
  find_library(ZeroMQ_LIBRARY
          NAMES zmq
          PATHS ${PC_ZeroMQ_LIBRARY_DIRS}
          )

  include_directories( ${ZeroMQ_INCLUDE_DIR} )
  link_directories( ${PC_ZeroMQ_LIBRARY_DIRS} )

To

find_package(ZeroMQ REQUIRED)