diff --git a/external/external_build.cmake b/external/external_build.cmake
index 6b01ed3..184cf30 100644
--- a/external/external_build.cmake
+++ b/external/external_build.cmake
@@ -266,7 +266,8 @@ ExternalProject_Add(omptl
   URL ${CMAKE_SOURCE_DIR}/external/omptl-20120422.tar.bz2
   CONFIGURE_COMMAND echo "No configure"
   BUILD_COMMAND echo "No build"
-  INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory ${OMPTL_BUILD_DIR} ${CMAKE_BINARY_DIR}/ext_install/include/omptl
+  INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory ${OMPTL_BUILD_DIR} ${EXT_INSTALL}/include/omptl
 )
+include_directories(${EXT_INSTALL}/include)
 ##include_directories(${OMPTL_BUILD_DIR}/src/)