[dune] configure plugin list (cont.)

configure.in

@@ -603,8 +603,11 @@ m4_foreach_w([__plugin],m4_esyscmd([ls src/plugins]),
   ])
 
 if test -f src/plugins/.disabled ; then
-  echo "(data_only_dirs $(cat src/plugins/.disabled))" > src/plugins/dune
-  chmod a-w  src/plugins/dune
+  echo ";; File generated by ./configure --disable-<PLUGIN>" > src/plugins/dune
+  echo "(include_subdirs no)" >> src/plugins/dune
+  echo ";; Disabled plugin list:" >> src/plugins/dune
+  echo "(data_only_dirs $(cat src/plugins/.disabled))" >> src/plugins/dune
+  chmod a-w src/plugins/dune
   rm src/plugins/.disabled
 fi