include(GNUInstallDirs)

if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
   set(GO4_INSTALL_MAINDIR "${CMAKE_INSTALL_DATADIR}" CACHE PATH "main go4 dir (DATADIR)")
   set(_go4sys "${CMAKE_INSTALL_DATADIR}/")
else()
   set(CMAKE_INSTALL_BINDIR "bin" CACHE PATH "go4 executables (bin)")
   set(CMAKE_INSTALL_LIBDIR "lib" CACHE PATH "go4 code libraries (lib)")
   set(CMAKE_INSTALL_INCLUDEDIR "include" CACHE PATH "go4 header files (include)")
   set(GO4_INSTALL_MAINDIR "${CMAKE_INSTALL_PREFIX}" CACHE PATH "main go4 dir (prefix)")
   set(_go4sys "")
endif()

set(GO4_INSTALL_ICONSDIR "${_go4sys}icons" CACHE PATH "go4 icons (icons/)")
set(GO4_INSTALL_MACROSDIR "${_go4sys}macros" CACHE PATH "go4 macros (macros/)")
set(GO4_INSTALL_ETCDIR "${_go4sys}etc" CACHE PATH "go4 etc files (etc/)")
set(GO4_INSTALL_DOCSDIR "${_go4sys}docs" CACHE PATH "go4 docs (docs/)")
set(GO4_INSTALL_BUILDDIR "${_go4sys}build" CACHE PATH "go4 build support (build/)")
set(GO4_INSTALL_HTMLDIR "${_go4sys}html" CACHE PATH "go4 html/js files (html/)")
set(GO4_INSTALL_PYTHONDIR "${_go4sys}python" CACHE PATH "go4 python files (python/)")

mark_as_advanced(
  CMAKE_INSTALL_BINDIR
  CMAKE_INSTALL_LIBDIR
  CMAKE_INSTALL_INCLUDEDIR
  GO4_INSTALL_MAINDIR
  GO4_INSTALL_ICONSDIR
  GO4_INSTALL_MACROSDIR
  GO4_INSTALL_ETCDIR
  GO4_INSTALL_DOCSDIR
  GO4_INSTALL_BUILDDIR
  GO4_INSTALL_HTMLDIR
  GO4_INSTALL_PYTHONDIR
)