diff --git a/build.py b/build.py
new file mode 100755
index 0000000..0702465
--- /dev/null
+++ b/build.py
@@ -0,0 +1,242 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# 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.
+#
+"""Builds binutils."""
+from __future__ import print_function
+
+import argparse
+import logging
+import multiprocessing
+import os
+import shutil
+import site
+import subprocess
+
+
+THIS_DIR = os.path.realpath(os.path.dirname(__file__))
+site.addsitedir(os.path.join(THIS_DIR, '../../ndk'))
+
+# pylint: disable=wrong-import-position
+import ndk.abis  # pylint: disable=import-error
+import ndk.ext.shutil  # pylint: disable=import-error
+import ndk.paths  # pylint: disable=import-error
+import ndk.timer  # pylint: disable=import-error
+# pylint: enable=wrong-import-position
+
+
+def logger():
+    """Returns the module level logger."""
+    return logging.getLogger(__name__)
+
+
+def makedirs(path):
+    """os.makedirs with logging."""
+    logger().info('makedirs ' + path)
+    os.makedirs(path)
+
+
+def rmtree(path):
+    """shutil.rmtree with logging."""
+    logger().info('rmtree ' + path)
+    shutil.rmtree(path)
+
+
+def chdir(path):
+    """os.chdir with logging."""
+    logger().info('chdir ' + path)
+    os.chdir(path)
+
+
+def check_call(cmd, *args, **kwargs):
+    """subprocess.check_call with logging."""
+    logger().info('check_call %s', subprocess.list2cmdline(cmd))
+    subprocess.check_call(cmd, *args, **kwargs)
+
+
+def configure(arch, host, install_dir, src_dir):
+    """Configures binutils."""
+    is_windows = host in ('win', 'win64')
+
+    configure_host = {
+        'darwin': 'x86_64-apple-darwin',
+        'linux': 'x86_64-linux-gnu',
+        'win': 'i586-pc-mingw32msvc',
+        'win64': 'x86_64-pc-mingw32msvc',
+    }[host]
+
+    sysroot = ndk.paths.sysroot_path(ndk.abis.arch_to_toolchain(arch))
+    configure_args = [
+        os.path.join(src_dir, 'configure'),
+        '--target={}'.format(ndk.abis.arch_to_triple(arch)),
+        '--host={}'.format(configure_host),
+        '--enable-gold=default',
+        '--enable-initfini-array',
+        '--enable-plugins',
+        '--with-sysroot={}'.format(sysroot),
+        '--prefix={}'.format(install_dir),
+    ]
+
+    if arch == 'arm64':
+        configure_args.append('--enable-fix-cortex-a53-835769')
+
+    if not is_windows:
+        # Multithreaded linking is implemented with pthreads, which we
+        # historically couldn't use on Windows.
+        # TODO: Try enabling this now that we have winpthreads in mingw.
+        configure_args.append('--enable-threads')
+
+    env = {}
+
+    m32 = False
+    if host == 'darwin':
+        toolchain = ndk.paths.android_path(
+            'prebuilts/gcc/darwin-x86/host/i686-apple-darwin-4.2.1')
+        toolchain_prefix = 'x86_64-linux'
+        env['MACOSX_DEPLOYMENT_TARGET'] = '10.6'
+    elif host == 'linux':
+        toolchain = ndk.paths.android_path(
+            'prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.8')
+        toolchain_prefix = 'x86_64-linux'
+    elif is_windows:
+        toolchain = ndk.paths.android_path(
+            'prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8')
+        toolchain_prefix = 'x86_64-w64-mingw32'
+        if host == 'win':
+            m32 = True
+    else:
+        raise NotImplementedError
+
+    cc = os.path.join(toolchain, 'bin', '{}-gcc'.format(toolchain_prefix))
+    cxx = os.path.join(toolchain, 'bin', '{}-g++'.format(toolchain_prefix))
+    ar = os.path.join(toolchain, 'bin', '{}-ar'.format(toolchain_prefix))
+
+    env['AR'] = ar
+    env['CC'] = cc
+    env['CXX'] = cxx
+    if m32:
+        env['CFLAGS'] = '-m32'
+        env['CXXFLAGS'] = '-m32'
+        env['LDFLAGS'] = '-m32'
+
+    env_args = ['env'] + ['='.join([k, v]) for k, v in env.items()]
+    check_call(env_args + configure_args)
+
+
+def build(jobs):
+    """Builds binutils."""
+    check_call(['make', '-j', str(jobs)])
+
+
+def install(jobs):
+    """Installs binutils."""
+    check_call(['make', 'install', '-j', str(jobs)])
+
+
+def dist(dist_dir, base_dir, package_name):
+    """Packages binutils for distribution."""
+    has_pbzip2 = ndk.ext.shutil.which('pbzip2') is not None
+    if has_pbzip2:
+        compress_arg = '--use-compress-prog=pbzip2'
+    else:
+        compress_arg = '-j'
+
+    package_path = os.path.join(dist_dir, package_name + 'tar.bz2')
+    cmd = [
+        'tar', compress_arg, '-cf', package_path, '-C', base_dir, package_name,
+    ]
+    subprocess.check_call(cmd)
+
+
+def parse_args():
+    """Parse command line arguments."""
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        '--arch', choices=ndk.abis.ALL_ARCHITECTURES, required=True)
+    parser.add_argument(
+        '--host', choices=('darwin', 'linux', 'win', 'win64'), required=True)
+
+    parser.add_argument(
+        '--clean', action='store_true',
+        help='Clean the out directory before building.')
+    parser.add_argument(
+        '-j', '--jobs', type=int, default=multiprocessing.cpu_count(),
+        help='Number of jobs to use when building.')
+
+    return parser.parse_args()
+
+
+def main():
+    """Program entry point."""
+    args = parse_args()
+    logging.basicConfig(level=logging.INFO)
+
+    total_timer = ndk.timer.Timer()
+    total_timer.start()
+
+    out_dir = ndk.paths.get_out_dir()
+    dist_dir = ndk.paths.get_dist_dir(out_dir)
+    base_build_dir = os.path.join(
+        out_dir, 'binutils', args.host, args.arch)
+    build_dir = os.path.join(base_build_dir, 'build')
+    package_name = 'binutils-{}-{}'.format(args.arch, args.host)
+    install_dir = os.path.join(base_build_dir, 'install', package_name)
+    binutils_path = os.path.join(THIS_DIR, 'binutils-2.27')
+
+    did_clean = False
+    clean_timer = ndk.timer.Timer()
+    if args.clean and os.path.exists(build_dir):
+        did_clean = True
+        with clean_timer:
+            rmtree(build_dir)
+
+    if not os.path.exists(build_dir):
+        makedirs(build_dir)
+
+    orig_dir = os.getcwd()
+    chdir(build_dir)
+    try:
+        configure_timer = ndk.timer.Timer()
+        with configure_timer:
+            configure(args.arch, args.host, install_dir, binutils_path)
+
+        build_timer = ndk.timer.Timer()
+        with build_timer:
+            build(args.jobs)
+
+        install_timer = ndk.timer.Timer()
+        with install_timer:
+            install(args.jobs)
+    finally:
+        chdir(orig_dir)
+
+    package_timer = ndk.timer.Timer()
+    with package_timer:
+        dist(dist_dir, os.path.dirname(install_dir), package_name)
+
+    total_timer.finish()
+
+    if did_clean:
+        print('Clean: {}'.format(clean_timer.duration))
+    print('Configure: {}'.format(configure_timer.duration))
+    print('Build: {}'.format(build_timer.duration))
+    print('Install: {}'.format(install_timer.duration))
+    print('Package: {}'.format(package_timer.duration))
+    print('Total: {}'.format(total_timer.duration))
+
+
+if __name__ == '__main__':
+    main()