diff --git a/artsc/CMakeLists.txt b/artsc/CMakeLists.txt
index 71f8baa..bddde63 100644
--- a/artsc/CMakeLists.txt
+++ b/artsc/CMakeLists.txt
@@ -46,6 +46,7 @@ include_directories(
   ${CMAKE_CURRENT_BINARY_DIR}
   ${CMAKE_BINARY_DIR}
   ${CMAKE_SOURCE_DIR}/artsc
+  ${CMAKE_SOURCE_DIR}/libltdl
   ${CMAKE_BINARY_DIR}/mcop
   ${CMAKE_SOURCE_DIR}/mcop
   ${CMAKE_BINARY_DIR}/flow
diff --git a/mcop/CMakeLists.txt b/mcop/CMakeLists.txt
index 7b4eec1..e497bf6 100644
--- a/mcop/CMakeLists.txt
+++ b/mcop/CMakeLists.txt
@@ -27,6 +27,7 @@ add_definitions(
 include_directories(
   ${CMAKE_BINARY_DIR}
   ${CMAKE_CURRENT_BINARY_DIR}
+  ${CMAKE_SOURCE_DIR}/libltdl
 )