distro: Add Linux-PAM.

* distro/packages/linux.scm: New file.
* Makefile.am (MODULES): Add it.

Makefile.am

@@ -65,6 +65,7 @@ MODULES =					\
   distro/packages/libffi.scm			\
   distro/packages/libsigsegv.scm		\
   distro/packages/libunistring.scm		\
+  distro/packages/linux.scm			\
   distro/packages/lout.scm			\
   distro/packages/m4.scm			\
   distro/packages/make-bootstrap.scm		\

distro/packages/linux.scm

@@ -0,0 +1,58 @@
+;;; 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 (distro packages linux)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (distro packages flex)
+  #:use-module (guix build-system gnu))
+
+(define-public linux-pam
+  (package
+    (name "linux-pam")
+    (version "1.1.6")
+    (source
+     (origin
+      (method url-fetch)
+      (uri (list (string-append "http://www.linux-pam.org/library/Linux-PAM-"
+                                version ".tar.bz2")
+                 (string-append "mirror://kernel.org/linux/libs/pam/library/Linux-PAM-"
+                                version ".tar.bz2")))
+      (sha256
+       (base32
+        "1hlz2kqvbjisvwyicdincq7nz897b9rrafyzccwzqiqg53b8gf5s"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("flex" ,flex)
+
+       ;; TODO: optional dependencies
+       ;; ("libxcrypt" ,libxcrypt)
+       ;; ("cracklib" ,cracklib)
+       ))
+    (arguments
+     ;; XXX: Tests won't run in chroot, presumably because /etc/pam.d
+     ;; isn't available.
+     '(#:tests? #f))
+    (home-page "http://www.linux-pam.org/")
+    (synopsis "Pluggable authentication modules for Linux")
+    (description
+     "A *Free* project to implement OSF's RFC 86.0.
+Pluggable authentication modules are small shared object files that can
+be used through the PAM API to perform tasks, like authenticating a user
+at login.  Local and dynamic reconfiguration are its key features")
+    (license "BSD")))