+option(enable_smpi "This variable set smpi lib." on)
+option(enable_gtnets "Whether gtnets model is activated." on)
+option(enable_java "Whether the Java bindings are activated." on)
+if(WIN32 OR APPLE)
+option(enable_lua "Whether the lua bindings are activated." off)
+option(enable_ruby "Whether the Ruby bindings are activated." off)
+else(WIN32 OR APPLE)
+option(enable_lua "Whether the lua bindings are activated." on)
+option(enable_ruby "Whether the Ruby bindings are activated." on)
+endif(WIN32 OR APPLE)
+option(enable_doc "Whether we should rebuild the documentation" off)