+set(DATADIR var CACHE PATH "External data resources files")
+
+# Normally CMake uses the build tree for the RPATH when building executables
+# etc on systems that use RPATH. When the software is installed the executables
+# etc are relinked by CMake to have the install RPATH. If this variable is set
+# to true then the software is always built with the install path for the RPATH
+# and does not need to be relinked when installed.
+# Rpath could be set and controlled by target property INSTALL_RPATH
+set(CMAKE_BUILD_WITH_INSTALL_RPATH true)