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diff --git a/src/engine/SCons/Variables/PathVariable.py b/src/engine/SCons/Variables/PathVariable.py
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+++ b/src/engine/SCons/Variables/PathVariable.py
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+"""SCons.Variables.PathVariable
+
+This file defines an option type for SCons implementing path settings.
+
+To be used whenever a a user-specified path override should be allowed.
+
+Arguments to PathVariable are:
+  option-name  = name of this option on the command line (e.g. "prefix")
+  option-help  = help string for option
+  option-dflt  = default value for this option
+  validator    = [optional] validator for option value.  Predefined
+                 validators are:
+
+                     PathAccept -- accepts any path setting; no validation
+                     PathIsDir  -- path must be an existing directory
+                     PathIsDirCreate -- path must be a dir; will create
+                     PathIsFile -- path must be a file
+                     PathExists -- path must exist (any type) [default]
+
+                 The validator is a function that is called and which
+                 should return True or False to indicate if the path
+                 is valid.  The arguments to the validator function
+                 are: (key, val, env).  The key is the name of the
+                 option, the val is the path specified for the option,
+                 and the env is the env to which the Otions have been
+                 added.
+
+Usage example:
+
+  Examples:
+      prefix=/usr/local
+
+  opts = Variables()
+
+  opts = Variables()
+  opts.Add(PathVariable('qtdir',
+                      'where the root of Qt is installed',
+                      qtdir, PathIsDir))
+  opts.Add(PathVariable('qt_includes',
+                      'where the Qt includes are installed',
+                      '$qtdir/includes', PathIsDirCreate))
+  opts.Add(PathVariable('qt_libraries',
+                      'where the Qt library is installed',
+                      '$qtdir/lib'))
+
+"""
+
+#
+# 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/PathVariable.py 4577 2009/12/27 19:44:43 scons"
+
+__all__ = ['PathVariable',]
+
+import os
+import os.path
+
+import SCons.Errors
+
+class _PathVariableClass:
+
+    def PathAccept(self, key, val, env):
+        """Accepts any path, no checking done."""
+        pass
+    
+    def PathIsDir(self, key, val, env):
+        """Validator to check if Path is a directory."""
+        if not os.path.isdir(val):
+            if os.path.isfile(val):
+                m = 'Directory path for option %s is a file: %s'
+            else:
+                m = 'Directory path for option %s does not exist: %s'
+            raise SCons.Errors.UserError(m % (key, val))
+
+    def PathIsDirCreate(self, key, val, env):
+        """Validator to check if Path is a directory,
+           creating it if it does not exist."""
+        if os.path.isfile(val):
+            m = 'Path for option %s is a file, not a directory: %s'
+            raise SCons.Errors.UserError(m % (key, val))
+        if not os.path.isdir(val):
+            os.makedirs(val)
+
+    def PathIsFile(self, key, val, env):
+        """validator to check if Path is a file"""
+        if not os.path.isfile(val):
+            if os.path.isdir(val):
+                m = 'File path for option %s is a directory: %s'
+            else:
+                m = 'File path for option %s does not exist: %s'
+            raise SCons.Errors.UserError(m % (key, val))
+
+    def PathExists(self, key, val, env):
+        """validator to check if Path exists"""
+        if not os.path.exists(val):
+            m = 'Path for option %s does not exist: %s'
+            raise SCons.Errors.UserError(m % (key, val))
+
+    def __call__(self, key, help, default, validator=None):
+        # NB: searchfunc is currenty undocumented and unsupported
+        """
+        The input parameters describe a 'path list' option, thus they
+        are returned with the correct converter and validator appended. The
+        result is usable for input to opts.Add() .
+
+        The 'default' option specifies the default path to use if the
+        user does not specify an override with this option.
+
+        validator is a validator, see this file for examples
+        """
+        if validator is None:
+            validator = self.PathExists
+
+        if SCons.Util.is_List(key) or SCons.Util.is_Tuple(key):
+            return (key, '%s ( /path/to/%s )' % (help, key[0]), default,
+                    validator, None)
+        else:
+            return (key, '%s ( /path/to/%s )' % (help, key), default,
+                    validator, None)
+
+PathVariable = _PathVariableClass()
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: