# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
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# https://github.com/google/snappy/pull/172

diff --git a/snappy.cc b/snappy.cc
index d414718..5b0d0d6 100644
--- a/snappy.cc
+++ b/snappy.cc
@@ -83,6 +83,7 @@
 #include <string>
 #include <utility>
 #include <vector>
+#include <functional>
 
 namespace snappy {
 
