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  #!/bin/bash

  # Copyright 2015-2016, Google Inc.
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are
  # met:
  #
  #     * Redistributions of source code must retain the above copyright
  # notice, this list of conditions and the following disclaimer.
  #     * Redistributions in binary form must reproduce the above
  # copyright notice, this list of conditions and the following disclaimer
  # in the documentation and/or other materials provided with the
  # distribution.
  #     * Neither the name of Google Inc. nor the names of its
  # contributors may be used to endorse or promote products derived from
  # this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  set -ex

  cd $(dirname $0)/../..
  set root=`pwd`
  CC=${"${CC:-cc}"}

  # allow openssl to be pre-downloaded
  if [ ! -e third_party/${openssl_fallback.tarball} ]
  then
    echo "Downloading ${openssl_fallback.base_uri + openssl_fallback.tarball} to third_party/${openssl_fallback.tarball}"
    wget ${openssl_fallback.base_uri + openssl_fallback.tarball} -O third_party/${openssl_fallback.tarball}
  fi

  # clean openssl directory
  rm -rf third_party/${openssl_fallback.extraction_dir}

  # extract archive
  cd third_party
  tar xfz ${openssl_fallback.tarball}

  # build openssl
  cd ${openssl_fallback.extraction_dir}
  CC="$CC -fPIC -fvisibility=hidden" ./config no-asm
  make

  # generate the 'grpc_obj' directory needed by the makefile
  mkdir grpc_obj
  cd grpc_obj
  ar x ../libcrypto.a
  ar x ../libssl.a