include(UsePkgConfig)
 
MACRO(PKGCONFIG_GETVAR _package _var _output_variable)
  SET(${_output_variable})
 
  # if pkg-config has been found
  IF(PKGCONFIG_EXECUTABLE)
 
    EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --exists RETURN_VALUE _return_VALUE OUTPUT_VARIABLE _pkgconfigDevNull )
 
    # and if the package of interest also exists for pkg-config, then get the information
    IF(NOT _return_VALUE)
 
      EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --variable ${_var} OUTPUT_VARIABLE ${_output_variable} )
 
    ENDIF(NOT _return_VALUE)
 
  ENDIF(PKGCONFIG_EXECUTABLE)
 
ENDMACRO(PKGCONFIG_GETVAR _package _var _output_variable)
 
macro(dbus_add_activation_service _sources)
    PKGCONFIG_GETVAR(dbus-1 session_bus_services_dir _install_dir)
    foreach (_i ${_sources})
        get_filename_component(_service_file ${_i} ABSOLUTE)
        string(REGEX REPLACE "\\.service.*$" ".service" _output_file ${_i})
        set(_target ${CMAKE_CURRENT_BINARY_DIR}/${_output_file})
        configure_file(${_service_file} ${_target})
        install(FILES ${_target} DESTINATION ${_install_dir})
    endforeach (_i ${ARGN})
endmacro(dbus_add_activation_service _sources)