diff --git a/src/mlpack/core/cereal/CMakeLists.txt b/src/mlpack/core/cereal/CMakeLists.txt
index e6acb18e3f..cad97c39ea 100644
--- a/src/mlpack/core/cereal/CMakeLists.txt
+++ b/src/mlpack/core/cereal/CMakeLists.txt
@@ -7,8 +7,6 @@ set(SOURCES
   pair_associative_container.hpp
   pointer_wrapper.hpp
   pointer_vector_wrapper.hpp
-  pointer_variant_wrapper.hpp
-  pointer_vector_variant_wrapper.hpp
   unordered_map.hpp
 )
 
diff --git a/src/mlpack/methods/ann/CMakeLists.txt b/src/mlpack/methods/ann/CMakeLists.txt
index a0620c0218..d70af2017a 100644
--- a/src/mlpack/methods/ann/CMakeLists.txt
+++ b/src/mlpack/methods/ann/CMakeLists.txt
@@ -6,22 +6,13 @@ set(SOURCES
   make_alias.hpp
   rnn.hpp
   rnn_impl.hpp
-  #brnn.hpp
-  #brnn_impl.hpp
-  #layer_names.hpp
 )
 
-#add_subdirectory(visitor)
-#add_subdirectory(activation_functions)
 add_subdirectory(init_rules)
 add_subdirectory(layer)
 add_subdirectory(loss_functions)
-#add_subdirectory(convolution_rules)
-#add_subdirectory(gan)
-#add_subdirectory(rbm)
-#add_subdirectory(augmented)
+add_subdirectory(convolution_rules)
 add_subdirectory(regularizer)
-add_subdirectory(util)
 
 # Add directory name to sources.
 set(DIR_SRCS)
diff --git a/src/mlpack/prereqs.hpp b/src/mlpack/prereqs.hpp
index 89d2d91e43..bad66fcab3 100644
--- a/src/mlpack/prereqs.hpp
+++ b/src/mlpack/prereqs.hpp
@@ -105,7 +105,6 @@ using enable_if_t = typename enable_if<B, T>::type;
 #include <cereal/archives/portable_binary.hpp>
 #include <cereal/archives/xml.hpp>
 #include <cereal/types/array.hpp>
-#include <cereal/types/boost_variant.hpp>
 #include <cereal/types/string.hpp>
 #include <cereal/types/tuple.hpp>
 #include <mlpack/core/cereal/unordered_map.hpp>
@@ -116,8 +115,6 @@ using enable_if_t = typename enable_if<B, T>::type;
 #include <mlpack/core/cereal/is_saving.hpp>
 #include <mlpack/core/arma_extend/serialize_armadillo.hpp>
 #include <mlpack/core/cereal/array_wrapper.hpp>
-#include <mlpack/core/cereal/pointer_variant_wrapper.hpp>
-#include <mlpack/core/cereal/pointer_vector_variant_wrapper.hpp>
 #include <mlpack/core/cereal/pointer_vector_wrapper.hpp>
 #include <mlpack/core/cereal/pointer_wrapper.hpp>
 #include <mlpack/core/data/has_serialize.hpp>