diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8f384b6f..5a0184166 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -153,10 +153,12 @@ endif( NO_BUILTIN )
 
 ##### system checks #############################
 
+tde_save_and_set( CMAKE_REQUIRED_INCLUDES ${CMAKE_SOURCE_DIR}/libltdl )
 check_include_file( "ltdl.h" HAVE_LTDL_H )
 if( NOT HAVE_LTDL_H )
-  tde_message_fatal( "ltdl.h are required, but not found on your system" )
+  tde_message_fatal( "ltdl.h is required, but not found on your system" )
 endif( )
+tde_restore( CMAKE_REQUIRED_INCLUDES )
 
 check_include_file( "alloca.h" HAVE_ALLOCA_H )
 check_include_file( "arpa/nameser8_compat.h" HAVE_ARPA_NAMESER8_COMPAT_H )
diff --git a/tdeinit/CMakeLists.txt b/tdeinit/CMakeLists.txt
index 741d60004..f4124e5d3 100644
--- a/tdeinit/CMakeLists.txt
+++ b/tdeinit/CMakeLists.txt
@@ -17,6 +17,7 @@ include_directories(
   ${CMAKE_BINARY_DIR}/tdecore
   ${CMAKE_SOURCE_DIR}
   ${CMAKE_SOURCE_DIR}/dcop
+  ${CMAKE_SOURCE_DIR}/libltdl
   ${CMAKE_SOURCE_DIR}/tdecore
   ${CMAKE_SOURCE_DIR}/tdeui
   ${CMAKE_SOURCE_DIR}/tdeio
diff --git a/tdeio/tdeio/CMakeLists.txt b/tdeio/tdeio/CMakeLists.txt
index 77d16f2c7..b4487db7f 100644
--- a/tdeio/tdeio/CMakeLists.txt
+++ b/tdeio/tdeio/CMakeLists.txt
@@ -18,6 +18,7 @@ include_directories(
   ${CMAKE_BINARY_DIR}/tdecore
   ${CMAKE_SOURCE_DIR}
   ${CMAKE_SOURCE_DIR}/dcop
+  ${CMAKE_SOURCE_DIR}/libltdl
   ${CMAKE_SOURCE_DIR}/tdecore
   ${CMAKE_SOURCE_DIR}/tdecore/network
   ${CMAKE_SOURCE_DIR}/tdeui