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diff --git a/Firestore/Example/ProtobufCpp.podspec b/Firestore/Example/ProtobufCpp.podspec
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+# Copyright 2018 Google
+#
+# Licensed 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.
+
+# A Private podspec for Protobuf which exposes the C++ headers (rather than
+# only the Obj-C headers). Suitable only for use inside this source tree.
+
+Pod::Spec.new do |s|
+  s.name             = 'ProtobufCpp'
+  s.version          = '3.5.2'
+  s.summary          = 'Protocol Buffers v.3 runtime library for C++.'
+  s.homepage         = 'https://github.com/google/protobuf'
+  s.license          = '3-Clause BSD License'
+  s.authors          = { 'The Protocol Buffers contributors' => 'protobuf@googlegroups.com' }
+  s.cocoapods_version = '>= 1.0'
+
+  s.source           = {
+    :git => 'https://github.com/google/protobuf.git',
+    :tag => "v#{s.version}"
+  }
+
+  s.source_files = 'src/**/*.{h,cc}'
+  s.exclude_files = # skip test files. (Yes, the test files are intermixed with
+                    # the source. No there doesn't seem to be a common/simple
+                    # pattern we could use to exclude them; 'test' appears in
+                    # various places throughout the file names and also in a
+                    # non-test file. So, we'll exclude all files that either
+                    # start with 'test' or include test and have a previous
+                    # character that isn't "y" (so that bytestream isn't
+                    # matched.))
+                    'src/**/test*.*',
+                    'src/**/*[^y]test*.*',
+                    'src/**/testing/**',
+                    'src/**/mock*',
+                    # skip the javascript handling code.
+                    'src/**/js/**',
+                    # skip the protoc compiler
+                    'src/google/protobuf/compiler/**/*'
+
+  s.header_mappings_dir = 'src/'
+
+  # Set a CPP symbol so the code knows to use framework imports.
+  s.pod_target_xcconfig = {
+    'GCC_PREPROCESSOR_DEFINITIONS' =>
+      '$(inherited) ' +
+      'GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS=1 ' +
+      'HAVE_PTHREAD=1',
+    'HEADER_SEARCH_PATHS' => '"${PODS_ROOT}/ProtobufCpp/src"',
+
+    # Cocoapods flattens header imports, leading to much anguish.  The
+    # following two statements work around this.
+    # - https://github.com/CocoaPods/CocoaPods/issues/1437
+    'USE_HEADERMAP' => 'NO',
+    'ALWAYS_SEARCH_USER_PATHS' => 'NO',
+  }
+
+  # Disable warnings that upstream does not concern itself with
+  s.compiler_flags = '$(inherited) ' +
+    '-Wno-comma ' +
+    '-Wno-shorten-64-to-32'
+
+  s.requires_arc = false
+  s.library = 'c++'
+end