if(NOT WIN32 AND NOT APPLE)
  find_package(PkgConfig)

  # Define our magical px_check_modules function
  function(px_check_modules name)
    if(PKG_CONFIG_FOUND)
      option(WITH_${name} "Search for ${name} package" ON)
      if (WITH_${name})
        pkg_check_modules(${name} ${ARGN})
        if(${${name}_FOUND})
          include_directories(${${name}_INCLUDE_DIRS})
          link_directories(${${name}_LIBRARY_DIRS})
        else()
          set(${name}_FOUND 0 PARENT_SCOPE)
        endif()
      else()
        set(${name}_FOUND 0 PARENT_SCOPE)
      endif()
    endif()
  endfunction(px_check_modules)
endif()