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diff --git a/src/interp/packtran.boot b/src/interp/packtran.boot
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+-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without
+-- modification, are permitted provided that the following conditions are
+-- met:
+--
+--     - Redistributions of source code must retain the above copyright
+--       notice, this list of conditions and the following disclaimer.
+--
+--     - Redistributions in binary form must reproduce the above copyright
+--       notice, this list of conditions and the following disclaimer in
+--       the documentation and/or other materials provided with the
+--       distribution.
+--
+--     - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+--       names of its contributors may be used to endorse or promote products
+--       derived from this software without specific prior written permission.
+--
+-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+)package "BOOT"
+
+-- The $useNewParser flag controls which parser will be used in the interpreter
+-- If nil then the old parser is used, otherwise Bill Burge's parser is used
+$useNewParser := true
+
+rePackageTran(sex, package) ==
+  _*PACKAGE_* : fluid := FIND_-PACKAGE STRING package
+  packageTran sex
+
+packageTran sex ==
+-- destructively translate all the symbols in the given s-expression to the 
+-- current package
+  SYMBOLP sex =>
+    EQ(_*PACKAGE_*, SYMBOL_-PACKAGE sex) => sex
+    INTERN STRING sex
+  CONSP sex =>
+    RPLACA(sex, packageTran CAR sex)
+    RPLACD(sex, packageTran CDR sex)
+    sex
+  sex
+
+zeroOneTran sex ==
+-- destructively translate the symbols |0| and |1| to their 
+-- integer counterparts
+  NSUBST("$EmptyMode", "?", sex)
+  sex
+