Add (guix build-system perl).

* guix/build-system/perl.scm, guix/build/perl-build-system.scm: New files.
* Makefile.am (MODULES): Add them.
* guix/build-system/gnu.scm (standard-inputs): Make public.

Makefile.am

@@ -39,12 +39,14 @@ MODULES =					\
   guix/licenses.scm				\
   guix/build-system.scm				\
   guix/build-system/gnu.scm			\
+  guix/build-system/perl.scm			\
   guix/build-system/trivial.scm			\
   guix/ftp-client.scm				\
   guix/store.scm				\
   guix/ui.scm					\
   guix/build/download.scm			\
   guix/build/gnu-build-system.scm		\
+  guix/build/perl-build-system.scm		\
   guix/build/utils.scm				\
   guix/build/union.scm				\
   guix/packages.scm				\

guix/build-system/gnu.scm

@@ -21,13 +21,13 @@
   #:use-module (guix utils)
   #:use-module (guix derivations)
   #:use-module (guix build-system)
-  #:use-module (guix build-system gnu)
   #:use-module (guix packages)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-39)
   #:use-module (ice-9 match)
   #:export (gnu-build
             gnu-build-system
+            standard-inputs
             package-with-explicit-inputs
             package-with-extra-configure-variable
             static-libgcc-package

guix/build-system/perl.scm

@@ -0,0 +1,103 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU 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.
+;;;
+;;; GNU 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build-system perl)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix derivations)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix packages)
+  #:use-module (ice-9 match)
+  #:export (perl-build
+            perl-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for Perl packages using the "makefile
+;; maker"---i.e., "perl Makefile.PL".  This is implemented as an extension of
+;; `gnu-build-system'.
+;;
+;; Code:
+
+(define* (perl-build store name source inputs
+                     #:key
+                     (perl (@ (gnu packages perl) perl))
+                     (tests? #t)
+                     (make-maker-flags ''())
+                     (phases '(@ (guix build perl-build-system)
+                                 %standard-phases))
+                     (outputs '("out"))
+                     (system (%current-system))
+                     (guile #f)
+                     (imported-modules '((guix build perl-build-system)
+                                         (guix build gnu-build-system)
+                                         (guix build utils)))
+                     (modules '((guix build perl-build-system)
+                                (guix build gnu-build-system)
+                                (guix build utils))))
+  "Build SOURCE using PERL, and with INPUTS.  This assumes that SOURCE
+provides a `Makefile.PL' file as its build system."
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (perl-build #:name ,name
+                   #:source ,(if (and source (derivation-path? source))
+                                 (derivation-path->output-path source)
+                                 source)
+                   #:make-maker-flags ,make-maker-flags
+                   #:system ,system
+                   #:test-target "test"
+                   #:tests? ,tests?
+                   #:outputs %outputs
+                   #:inputs %build-inputs)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system))
+      ((and (? string?) (? derivation-path?))
+       guile)
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(gnu packages base)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system)))))
+
+  (let ((perl (package-derivation store perl system)))
+    (build-expression->derivation store name system
+                                  builder
+                                  `(,@(if source
+                                          `(("source" ,source))
+                                          '())
+                                    ("perl" ,perl)
+                                    ,@inputs
+
+                                    ;; Keep the standard inputs of
+                                    ;; `gnu-build-system'.
+                                    ,@(standard-inputs system))
+
+                                  #:modules imported-modules
+                                  #:outputs outputs
+                                  #:guile-for-build guile-for-build)))
+
+(define perl-build-system
+  (build-system (name 'perl)
+                (description "The standard Perl build system")
+                (build perl-build)))
+
+;;; perl.scm ends here

guix/build/perl-build-system.scm

@@ -0,0 +1,61 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU 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.
+;;;
+;;; GNU 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build perl-build-system)
+  #:use-module ((guix build gnu-build-system)
+                #:renamer (symbol-prefix-proc 'gnu:))
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:export (%standard-phases
+            perl-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard Perl package build procedure.
+;;
+;; Code:
+
+(define* (configure #:key outputs (make-maker-flags '())
+                    #:allow-other-keys)
+  "Configure the given Perl package."
+  (let ((out (assoc-ref outputs "out")))
+    (if (file-exists? "Makefile.PL")
+        (let ((args `("Makefile.PL" ,(string-append "PREFIX=" out)
+                      "INSTALLDIRS=site" ,@make-maker-flags)))
+          (format #t "running `perl' with arguments ~s~%" args)
+          (zero? (apply system* "perl" args)))
+        (error "no Makefile.PL found"))))
+
+(define %standard-phases
+  ;; Everything is as with the GNU Build System except for the `configure'
+  ;; phase.
+  (alist-replace 'configure configure
+                 gnu:%standard-phases))
+
+(define* (perl-build #:key inputs (phases %standard-phases)
+                     #:allow-other-keys #:rest args)
+  "Build the given Perl package, applying all of PHASES in order."
+  (set-path-environment-variable "PERL5LIB" '("lib/perl5/site_perl")
+                                 (match inputs
+                                   (((_ . path) ...)
+                                    path)))
+  (apply gnu:gnu-build
+         #:inputs inputs #:phases phases
+         args))
+
+;;; perl-build-system.scm ends here