+set(JSON_CHECKER "" CACHE STRING "JSON linter")
+
+# Default GNU directories path variables
+set(BINDIR bin CACHE PATH "User executables")
+set(ETCDIR etc CACHE PATH "Read only system configuration data")
+set(LIBDIR lib CACHE PATH "System library directory")
+set(HTTPDIR htdocs CACHE PATH "HTML5 data directory")
+set(DATADIR data 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)