if(UNIX)
  include(GNUInstallDirs)
  set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")

  include(CheckIncludeFile)
  Check_Include_File(sys/auxv.h HAVE_SYS_AUXV)
  if(EXISTS "/lib/systemd/system")
    set(CMAKE_INSTALL_SYSTEMD_UNITDIR "/lib/systemd/system" CACHE STRING "Where to install systemd unit files")
  endif()
endif()