diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7013f8adf..bc23c12b4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -140,10 +140,12 @@ 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/kinit/CMakeLists.txt b/kinit/CMakeLists.txt
index db4da097a..c21282182 100644
--- a/kinit/CMakeLists.txt
+++ b/kinit/CMakeLists.txt
@@ -17,6 +17,7 @@ include_directories(
   ${CMAKE_BINARY_DIR}/kdecore
   ${CMAKE_SOURCE_DIR}
   ${CMAKE_SOURCE_DIR}/dcop
+  ${CMAKE_SOURCE_DIR}/libltdl
   ${CMAKE_SOURCE_DIR}/kdecore
   ${CMAKE_SOURCE_DIR}/kdeui
   ${CMAKE_SOURCE_DIR}/kio
diff --git a/kio/kio/CMakeLists.txt b/kio/kio/CMakeLists.txt
index 6a1726315..f1053b703 100644
--- a/kio/kio/CMakeLists.txt
+++ b/kio/kio/CMakeLists.txt
@@ -18,6 +18,7 @@ include_directories(
   ${CMAKE_BINARY_DIR}/kdecore
   ${CMAKE_SOURCE_DIR}
   ${CMAKE_SOURCE_DIR}/dcop
+  ${CMAKE_SOURCE_DIR}/libltdl
   ${CMAKE_SOURCE_DIR}/kdecore
   ${CMAKE_SOURCE_DIR}/kdecore/network
   ${CMAKE_SOURCE_DIR}/kdeui