diff --git a/CMakeLists.txt b/CMakeLists.txt
index b9d2edf..1b3c80e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,13 +39,13 @@ MESSAGE(STATUS "Using the target ${CosmoTool_local} to build python module")
 include(${CMAKE_SOURCE_DIR}/external/external_build.cmake)
 
 IF(YORICK_SUPPORT)
-  IF(EXISTS ${NETCDFCPP_INCLUDE_PATH}/netcdf AND ${NETCDFCPP_LIBRARY} MATCHES "netcdf_c\\+\\+4")
+  IF((EXISTS ${NETCDFCPP_INCLUDE_PATH}/netcdf AND ${NETCDFCPP_LIBRARY} MATCHES "netcdf_c\\+\\+4") OR (INTERNAL_NETCDF))
     SET(FOUND_NETCDF4 1)
     FILE(WRITE ${CMAKE_BINARY_DIR}/src/ctool_netcdf_ver.hpp "#define NETCDFCPP4 1")
-  ELSE(EXISTS ${NETCDFCPP_INCLUDE_PATH}/netcdf AND ${NETCDFCPP_LIBRARY} MATCHES "netcdf_c\\+\\+4")
+  ELSE((EXISTS ${NETCDFCPP_INCLUDE_PATH}/netcdf AND ${NETCDFCPP_LIBRARY} MATCHES "netcdf_c\\+\\+4") OR (INTERNAL_NETCDF))
     SET(FOUND_NETCDF3 1)
     FILE(WRITE ${CMAKE_BINARY_DIR}/src/ctool_netcdf_ver.hpp "#undef NETCDFCPP4")
-  ENDIF(EXISTS ${NETCDFCPP_INCLUDE_PATH}/netcdf AND ${NETCDFCPP_LIBRARY} MATCHES "netcdf_c\\+\\+4")
+  ENDIF((EXISTS ${NETCDFCPP_INCLUDE_PATH}/netcdf AND ${NETCDFCPP_LIBRARY} MATCHES "netcdf_c\\+\\+4") OR (INTERNAL_NETCDF))
 ENDIF(YORICK_SUPPORT)
 
 find_program(CYTHON cython)