diff --git a/CMakeLists.txt b/CMakeLists.txt
index e7691d8..c3648f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,7 +39,13 @@ tde_setup_paths( )
 
 ##### optional stuff
 
-option( WITH_GCC_VISIBILITY "Enable fvisibility and fvisibility-inlines-hidden" OFF )
+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" ON )
 
 
 ##### configure checks
@@ -58,7 +64,7 @@ set( CMAKE_MODULE_LINKER_FLAGS "-Wl,--no-undefined" )
 
 ##### directories
 
-add_subdirectory( tdeio_ftps )
+tde_conditional_add_subdirectory( BUILD_ALL tdeio_ftps )
 
 
 ##### write configure files