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+;;;; Copyright (C) 2000, 2001, 2006 Free Software Foundation, Inc.
+;;;;
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;;
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;;;; Lesser General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;;;;
+
+;;;; Safe subset of R5RS bindings
+
+(define-module (ice-9 safe)
+ :export (safe-environment make-safe-module))
+
+(define safe-r5rs-interface (resolve-interface '(ice-9 safe-r5rs)))
+
+(define (safe-environment n)
+ (if (not (= n 5))
+ (scm-error 'misc-error 'safe-environment
+ "~A is not a valid version"
+ (list n)
+ '()))
+ safe-r5rs-interface)
+
+(define (make-safe-module)
+ (make-module 1021 (list safe-r5rs-interface)))