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-rw-r--r--guix/build-system/trivial.scm39
-rw-r--r--guix/packages.scm2
2 files changed, 40 insertions, 1 deletions
diff --git a/guix/build-system/trivial.scm b/guix/build-system/trivial.scm
new file mode 100644
index 0000000000..1134ae988c
--- /dev/null
+++ 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)))
diff --git a/guix/packages.scm b/guix/packages.scm
index 1394f980f7..ea5302e60b 100644
--- a/guix/packages.scm
+++ b/guix/packages.scm
@@ -261,7 +261,7 @@ recursively."
(cache package system
(apply builder
store (package-full-name package)
- (package-source-derivation store source)
+ (and source (package-source-derivation store source))
inputs
#:outputs outputs #:system system
(if (procedure? args)