+# We have some custom .cmake scripts not in the official distribution.
+set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/CMakeModules;${CMAKE_MODULE_PATH}")
+
+if(${CMAKE_VERSION} VERSION_GREATER 2.8.4)
+ # use official include provided by latest CMake
+ include(GNUInstallDirs)
+else(${CMAKE_VERSION} VERSION_GREATER 2.8.4)
+ # backward compatibility: use our own module for older cmake versions
+ include(OldGNUInstallDirs)
+endif(${CMAKE_VERSION} VERSION_GREATER 2.8.4)
+