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diff --git a/crn/packages.scm b/crn/packages.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Andrew Whatson <whatson@gmail.com>
+;;;
+;;; This file is NOT part of GNU Guix.
+;;;
+;;; 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/>.
+
+(define-module (crn packages)
+  #:use-module ((gnu packages) #:prefix gnu:)
+  #:use-module (guix diagnostics)
+  #:use-module (guix i18n)
+  #:use-module (srfi srfi-1)
+  #:export (search-patch
+            search-patches
+            %patch-path))
+
+(define (search-patch file-name)
+  "Search the patch FILE-NAME.  Raise an error if not found."
+  (or (search-path (%patch-path) file-name)
+      (raise (formatted-message (G_ "~a: patch not found")
+                                file-name))))
+
+(define-syntax-rule (search-patches file-name ...)
+  "Return the list of absolute file names corresponding to each
+FILE-NAME found in %PATCH-PATH."
+  (list (search-patch file-name) ...))
+
+(define %channel-root
+  (find (lambda (path)
+          (file-exists? (string-append path "/crn/packages.scm")))
+        %load-path))
+
+(define %patch-path
+  (make-parameter
+   (cons
+    (string-append %channel-root "/crn/packages/patches")
+    (gnu:%patch-path))))