https://bugs.gentoo.org/844235
--- a/src/mongo/db/auth/security_key_test.cpp
+++ b/src/mongo/db/auth/security_key_test.cpp
@@ -30,6 +30,7 @@
 #include "mongo/platform/basic.h"
 
 #include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
 
 #include "mongo/base/string_data.h"
 #include "mongo/db/auth/authorization_manager.h"
--- a/src/mongo/db/storage/storage_repair_observer.cpp
+++ b/src/mongo/db/storage/storage_repair_observer.cpp
@@ -41,6 +41,7 @@
 #include <sys/types.h>
 #endif
 
+#include <boost/filesystem/fstream.hpp>
 #include <boost/filesystem/path.hpp>
 
 #include "mongo/db/dbhelpers.h"
--- a/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine_test.cpp
+++ b/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine_test.cpp
@@ -34,6 +34,7 @@
 #include "mongo/db/storage/kv/kv_engine_test_harness.h"
 
 #include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
 #include <boost/filesystem/path.hpp>
 #include <memory>
 
--- a/src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp
+++ b/src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp
@@ -36,6 +36,7 @@
 #include <limits>
 
 #include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
 #include <boost/filesystem/path.hpp>
 
 #include "mongo/base/simple_string_data_comparator.h"
--- a/src/mongo/shell/shell_utils_extended.cpp
+++ b/src/mongo/shell/shell_utils_extended.cpp
@@ -37,6 +37,7 @@
 #endif
 
 #include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
 #include <fstream>
 
 #include "mongo/bson/bson_validate.h"
--- a/src/mongo/util/processinfo_linux.cpp
+++ b/src/mongo/util/processinfo_linux.cpp
@@ -36,6 +36,7 @@
 #include <iostream>
 #include <malloc.h>
 #include <pcrecpp.h>
+#include <fstream>
 #include <sched.h>
 #include <stdio.h>
 #include <sys/mman.h>
--- a/src/mongo/util/stacktrace_threads.cpp
+++ b/src/mongo/util/stacktrace_threads.cpp
@@ -36,6 +36,7 @@
 #include <array>
 #include <atomic>
 #include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
 #include <cctype>
 #include <cstdint>
 #include <cstdlib>