diff --git a/CMakeLists.txt b/CMakeLists.txt
index f40664f..b23f4a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,11 +23,12 @@ cmake_minimum_required( VERSION 2.8 )
 
 include( CheckCXXSourceCompiles )
 
+
+##### include our cmake modules #################
+
 set( CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules" )
 include( TDEMacros )
 
-include( ConfigureChecks.cmake )
-
 
 ##### install paths setup #######################
 
@@ -38,6 +39,24 @@ tde_setup_install_path( INCLUDE_INSTALL_DIR   "${CMAKE_INSTALL_PREFIX}/include/t
 tde_setup_install_path( PKGCONFIG_INSTALL_DIR "${LIB_INSTALL_DIR}/pkgconfig" )
 
 
+##### optional stuff ############################
+
+option( WITH_ALL_OPTIONS "Enable all optional support" OFF )
+
+option( WITH_QT3 "Build TQt interface based on TQt3" ${WITH_ALL_OPTIONS} )
+option( WITH_QT4 "Build TQt interface based on Qt4" OFF )
+
+
+##### user requested modules ####################
+
+option( BUILD_ALL "Build all" OFF )
+
+
+##### configure checks ##########################
+
+include( ConfigureChecks.cmake )
+
+
 ##### tqtinterface sources ######################
 
 add_subdirectory( qtinterface )
diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 7c1549d..2f8204f 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -13,11 +13,24 @@ macro( qt_message )
   message( STATUS "${ARGN}" )
 endmacro( )
 
+if( (WITH_QT3 OR USE_QT3) AND (WITH_QT4 OR USE_QT4) )
+  tde_message_fatal( "Options WITH_QT3 and WITH_QT4 are mutually exclusive." )
+endif( )
 
-if( DEFINED USE_QT3 )
+if( WITH_QT3 OR USE_QT3 )
   set( QT_VERSION "3" )
-elseif( DEFINED USE_QT4 )
+elseif( WITH_QT4 OR USE_QT4 )
   set( QT_VERSION "4" )
+  message( AUTHOR_WARNING
+    " ------------------------------------------------------------- \n"
+    " ***  NOTE  *** \n"
+    " \n"
+    " The code for the TQt interface based on Qt4 is not maintained \n"
+    " and the result can cause unexpected problems.\n"
+    " \n"
+    " It is not recommended to build a TQt interface based on Qt4!\n"
+    " ------------------------------------------------------------- \n"
+  )
 endif()