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use  Alien::m4;
unshift @PATH,  Alien::m4->bin_dir;
unshift @ACLOCAL_PATH,  Alien::m4->dist_dir . "/share/aclocal";

use Alien::libtool;
unshift @PATH, Alien::libtool->bin_dir;
unshift @ACLOCAL_PATH,  Alien::libtool->dist_dir . "/share/aclocal";

use Alien::automake;
unshift @PATH, Alien::automake->bin_dir;
unshift @ACLOCAL_PATH,  Alien::automake->dist_dir . "/share/aclocal";

use Alien::autoconf;
unshift @PATH, Alien::autoconf->bin_dir;
unshift @ACLOCAL_PATH,  Alien::autoconf->dist_dir . "/share/aclocal";
unshift @ACLOCAL_PATH,  Alien::autoconf->dist_dir . "/share/autoconf";

probe sub {
  my($build) = @_;  # $build is the Alien::Build instance.
  system( 'pkg-config --exists grpc++ > /dev/null 2>&1' );
  return 'share' unless $? == 0;

  my ($cmd_result) = capture {
    system( 'protoc', '--version');
  };
  return 'share' unless $cmd_result =~ /libprotoc.3/;

  return 'system';
};

 meta->prop->{start_url} = 'http://github.com/grpc/grpc#v1.4.2';
 plugin 'Download::Git' =>(
   version => qr/^v([0-9\.]+)$/,
 );

share {

  build [
    [ '%{git} submodule update --init' ],
    ## Hot patch so new gcc7.x warnings are not converted into error. 
    ## -Werror is considered to be bad to use in production code. 
    [ 'find . -type f -not -regex ".*\.\(o\|h\|c\|a\|t\|cc\|so\)" -exec sed -i -e "s/-Werror/-Wno-excessive-errors/g" {} \;' ],
    [ 'bash <<"USE_A_SHELL"
        echo "** Build Dir is: "; pwd
        prefix=%{.install.prefix}  PROTOBUF_CONFIG_OPTS=--prefix=%{.install.prefix} EMBED_OPENSSL=true make
        prefix=%{.install.prefix} make install
        cd ./third_party/protobuf
        make install
        make clean
        cd ../../
        make clean
USE_A_SHELL
    ' ],
  ];

  gather [
    # Trust the force.
    # Automagic will rewrite your path.
    [ 'echo "1.4.1"', \'%{.runtime.version}' ],
    [ 'echo "-L%{.install.prefix}/lib -lgrpc -lgrpc++ -lprotobuf -lpthread"', \'%{.runtime.libs}'    ],
    [ 'echo "-I%{.install.prefix}/include -pthread"', \'%{.runtime.cflags}'    ],
  ];

};

sys {
  gather [
    [ 'pkg-config --modversion  grpc++', \'%{.runtime.version}' ],
    [ 'pkg-config --cflags grpc grpc++  protobuf', \'%{.runtime.cflags}'  ],
    [ 'pkg-config --libs   grpc grpc++  protobuf', \'%{.runtime.libs}'    ],
  ];
};