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diff --git a/engine/SCons/Variables/PackageVariable.py b/engine/SCons/Variables/PackageVariable.py
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+"""engine.SCons.Variables.PackageVariable
+
+This file defines the option type for SCons implementing 'package
+activation'.
+
+To be used whenever a 'package' may be enabled/disabled and the
+package path may be specified.
+
+Usage example:
+
+  Examples:
+      x11=no   (disables X11 support)
+      x11=yes  (will search for the package installation dir)
+      x11=/usr/local/X11 (will check this path for existance)
+
+  To replace autoconf's --with-xxx=yyy 
+
+  opts = Variables()
+  opts.Add(PackageVariable('x11',
+                         'use X11 installed here (yes = search some places',
+                         'yes'))
+  ...
+  if env['x11'] == True:
+      dir = ... search X11 in some standard places ...
+      env['x11'] = dir 
+  if env['x11']:
+      ... build with x11 ...
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "src/engine/SCons/Variables/PackageVariable.py 4577 2009/12/27 19:43:56 scons"
+
+__all__ = ['PackageVariable',]
+
+import string
+
+import SCons.Errors
+
+__enable_strings  = ('1', 'yes', 'true',  'on', 'enable', 'search')
+__disable_strings = ('0', 'no',  'false', 'off', 'disable')
+
+def _converter(val):
+    """
+    """
+    lval = string.lower(val)
+    if lval in __enable_strings: return True
+    if lval in __disable_strings: return False
+    #raise ValueError("Invalid value for boolean option: %s" % val)
+    return val
+
+
+def _validator(key, val, env, searchfunc):
+    # NB: searchfunc is currenty undocumented and unsupported
+    """
+    """
+    # todo: write validator, check for path
+    import os
+    if env[key] is True:
+        if searchfunc:
+            env[key] = searchfunc(key, val)
+    elif env[key] and not os.path.exists(val):
+        raise SCons.Errors.UserError(
+            'Path does not exist for option %s: %s' % (key, val))
+
+
+def PackageVariable(key, help, default, searchfunc=None):
+    # NB: searchfunc is currenty undocumented and unsupported
+    """
+    The input parameters describe a 'package list' option, thus they
+    are returned with the correct converter and validator appended. The
+    result is usable for input to opts.Add() .
+
+    A 'package list' option may either be 'all', 'none' or a list of
+    package names (seperated by space).
+    """
+    help = string.join(
+        (help, '( yes | no | /path/to/%s )' % key),
+        '\n    ')
+    return (key, help, default,
+            lambda k, v, e, f=searchfunc: _validator(k,v,e,f),
+            _converter)
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: