diff --git a/CMakeLists.txt b/CMakeLists.txt
index 168b306..924bff4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,6 +39,12 @@ include( TDESetupPaths )
 tde_setup_paths( )
 
 
+##### optional stuff ############################
+
+option( WITH_ALL_OPTIONS "Enable all optional support" OFF )
+option( WITH_GCC_VISIBILITY "Enable fvisibility and fvisibility-inlines-hidden" ${WITH_ALL_OPTIONS} )
+
+
 ##### user requested modules ####################
 
 option( BUILD_ALL "Build all" OFF )