Allow chromium to be built with some system libs by introducing...

chrome/SConscript

 # Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 
 Import(['env'])
 
 env_res = env.Clone()
 env_test = env.Clone()
@@ skipping 374 matching lines @@
   env_flat.Depends(browser_res, flats_out)
 
 
 # TODO(port)
   env_test.Object('test/test_file_util.cc',
                   CPPPATH=['..'] + env['CPPPATH'])
 
 sconscript_files = [
     'test/chrome_plugin/SConscript',
     'tools/test/image_diff/SConscript',
-    'third_party/hunspell/SConscript',
-    '$THIRD_PARTY_DIR/sqlite/SConscript',
 ]
 
+if not env.WantSystemLib('hunspell'):
+  sconscript_files.append('third_party/hunspell/SConscript')
+if not env.WantSystemLib('sqlite'):
+  sconscript_files.append('$THIRD_PARTY_DIR/sqlite/SConscript')
+
 # TODO(port)
 if env['PLATFORM'] == 'win32':
   sconscript_files.extend([
       'app/resources/SConscript',
       'app/theme/SConscript',
       'browser/views/SConscript',
       'installer/mini_installer/SConscript',
       'installer/setup/SConscript',
       'installer/util/SConscript',
       'test/activex_test_control/SConscript',
@@ skipping 35 matching lines @@
   env.Alias('chrome', i)
 
 
 i = env.Command('$TARGET_ROOT/resources/inspector',
             '$CHROME_SRC_DIR/webkit/port/page/inspector',
             Copy('$TARGET', '$SOURCE'),
             source_scanner=DirScanner)
 env.Alias('chrome', i)
 
 env.Alias('chrome', env.Alias('webkit'))