diff --git a/buck-tools/build.defs b/buck-tools/build.defs
new file mode 100644
index 0000000..3ea506c
--- /dev/null
+++ b/buck-tools/build.defs
@@ -0,0 +1,80 @@
+# Copyright (C) 2013 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.
+
+# These definitions support building a runnable version of Gerrit.
+
+DOCS_HTML = '//Documentation:html'
+DOCS_LIB = '//Documentation:index_lib'
+LIBS = [
+  '//gerrit-war:log4j-config',
+  '//gerrit-war:init',
+  '//lib:postgresql',
+  '//lib/log:impl_log4j',
+]
+PGMLIBS = ['//gerrit-pgm:pgm']
+
+def scan_plugins():
+  import os
+  deps = []
+  for n in os.listdir('plugins'):
+    if os.path.exists(os.path.join('plugins', n, 'BUCK')):
+      deps.append('//plugins/%s:%s__plugin' % (n, n))
+  return deps
+
+def war(
+    name,
+    libs = [],
+    pgmlibs = [],
+    context = [],
+    visibility = [],
+    docs = False
+    ):
+  cmd = ['$(exe //tools:pack_war)', '-o', '$OUT', '--tmp', '$TMP']
+  for l in libs:
+    cmd.extend(['--lib', '$(classpath %s)' % l])
+  for l in pgmlibs:
+    cmd.extend(['--pgmlib', '$(classpath %s)' % l])
+
+  if docs:
+    cmd.append('$(location %s)' % DOCS_HTML)
+    cmd.extend(['--lib', '$(classpath %s)' % DOCS_LIB])
+  if context:
+    for t in context:
+      cmd.append('$(location %s)' % t)
+
+  genrule(
+    name = name,
+    cmd = ' '.join(cmd),
+    out = name + '.war',
+    visibility = visibility,
+  )
+
+def gerrit_war(name, ui = 'ui_optdbg', context = [], docs = False, visibility = []):
+  ui_deps = []
+  if ui:
+    if ui == 'polygerrit' or ui == 'ui_optdbg' or ui == 'ui_optdbg_r':
+      ui_deps.append('//polygerrit-ui/app:polygerrit_ui')
+    if ui != 'polygerrit':
+      ui_deps.append('//gerrit-gwtui:%s' % ui)
+  war(
+    name = name,
+    libs = LIBS + ['//gerrit-war:version'],
+    pgmlibs = PGMLIBS,
+    context = ui_deps + context + [
+      '//gerrit-main:main_bin',
+      '//gerrit-war:webapp_assets',
+    ],
+    docs = docs,
+    visibility = visibility,
+  )