Set up default include directories on module target

CMakeLists.txt

@@ -20,6 +20,9 @@ list(APPEND CMAKE_MODULE_PATH ${dune-common_MODULE_PATH}
 #include the dune macros
 include(DuneMacros)
 
+# deactivate global include-directories
+dune_policy(SET DP_DEFAULT_INCLUDE_DIRS NEW)
+
 # start a dune project with information from dune.module
 dune_project()
 
@@ -28,6 +31,9 @@ dune_add_library(duneistl INTERFACE
   EXPORT_NAME ISTL
   LINK_LIBRARIES Dune::Common)
 
+# set include directories to target
+dune_default_include_directories(duneistl INTERFACE)
+
 add_subdirectory(cmake/modules)
 add_subdirectory(dune)
 add_subdirectory(doc)