diff --git a/CMakeLists.txt b/CMakeLists.txt
index d8450c9..11b6e06 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,7 @@ set( VERSION R14.1.0 )
 
 include( FindPkgConfig          )
 include( CheckFunctionExists    )
+include( CheckSymbolExists      )
 include( CheckIncludeFile       )
 include( CheckLibraryExists     )
 include( CheckCSourceCompiles   )
diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 069df06..36f6707 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -8,25 +8,23 @@
 
 
 # required stuff
-find_package( TQt )
-find_package( TDE )
 
 tde_setup_architecture_flags( )
 
 include(TestBigEndian)
 test_big_endian(WORDS_BIGENDIAN)
 
+tde_setup_largefiles( )
 
-##### check for gcc visibility support
+find_package( TQt )
+find_package( TDE )
+
+
+##### check for gcc visibility support #########
 
 if( WITH_GCC_VISIBILITY )
-  if( NOT UNIX )
-    tde_message_fatal( "gcc visibility support was requested, but your system is not *NIX" )
-  endif( NOT UNIX )
-  set( __KDE_HAVE_GCC_VISIBILITY 1 )
-  set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden")
-  set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden")
-endif( WITH_GCC_VISIBILITY )
+  tde_setup_gcc_visibility( )
+endif( )
 
 
 ##### check for tdeldap