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+;;; Sly
+;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; This program is free software: you can redistribute it and/or
+;;; modify it under the terms of the GNU General Public License as
+;;; published by the Free Software Foundation, either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; This program 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
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Wrapper helper procedures.
+;;
+;;; Code:
+
+(define-module (sly wrappers util)
+  #:export (define-enumeration))
+
+;; Borrowed from guile-opengl
+(define-syntax-rule (define-enumeration enumerator (name value) ...)
+  (define-syntax enumerator
+    (lambda (x)
+      (syntax-case x ()
+        ((_)
+         #''(name ...))
+        ((_ enum) (number? (syntax->datum #'enum))
+         #'enum)
+        ((_ enum)
+         (or (assq-ref '((name . value) ...)
+                       (syntax->datum #'enum))
+             (syntax-violation 'enumerator "invalid enumerated value"
+                               #'enum)))))))