Add (guix build-system trivial).

* guix/build-system/trivial.scm: New file. * Makefile.am (MODULES): Add it. * tests/packages.scm ("trivial"): New test. * guix/packages.scm (package-derivation): Allow SOURCE to be #f.
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diff --git a/guix/build-system/trivial.scm b/guix/build-system/trivial.scm
new file mode 100644
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+++ b/guix/build-system/trivial.scm
@@ -0,0 +1,39 @@
+;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; Guix 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.
+;;;
+;;; Guix 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 Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build-system trivial)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix derivations)
+  #:use-module (guix build-system)
+  #:export (trivial-build-system))
+
+(define* (trivial-build store name source inputs
+                        #:key outputs system builder (modules '()))
+  "Run build expression BUILDER, an expression, for SYSTEM.  SOURCE is
+ignored."
+  (build-expression->derivation store name system builder inputs
+                                #:outputs outputs
+                                #:modules modules))
+
+(define trivial-build-system
+  (build-system (name 'trivial)
+                (description
+                 "Trivial build system, to run arbitrary Scheme build expressions")
+                (build trivial-build)
+                (cross-build trivial-build)))