gnu: Add rc.

* gnu/packages/rc.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu-system.am

@@ -256,6 +256,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/qemu.scm				\
   gnu/packages/qt.scm				\
   gnu/packages/ratpoison.scm			\
+  gnu/packages/rc.scm				\
   gnu/packages/rdesktop.scm			\
   gnu/packages/rdf.scm				\
   gnu/packages/readline.scm			\

gnu/packages/rc.scm

@@ -0,0 +1,72 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Jeff Mickey <j@codemac.net>
+;;;
+;;; 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 (gnu packages rc)
+  #:use-module (gnu packages autotools)
+  #:use-module (gnu packages perl)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages readline)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix git-download)
+  #:use-module (guix licenses)
+  #:use-module (guix packages))
+
+(define-public rc
+  (package
+    (name "rc")
+    (version "1.7.4")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "git://github.com/rakitzis/rc.git")
+                    ;; commit name 'release: rc-1.7.4'
+                    (commit "c884da53a7c885d46ace2b92de78946855b18e92")))
+              (sha256
+               (base32
+                "00mgzvrrh9w96xa85g4gjbsvq02f08k4jwjcdnxq7kyh5xgiw95l"))
+              (file-name (string-append name "-" version "-checkout"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:configure-flags
+       '("--with-edit=gnu")
+       #:phases
+       (modify-phases %standard-phases
+         (add-after
+          'unpack 'autoreconf
+          (lambda _ (zero? (system* "autoreconf" "-vfi"))))
+         (add-before
+          'autoreconf 'patch-trip.rc
+          (lambda _
+            (substitute* "trip.rc"
+              (("/bin/pwd") (which "pwd"))
+              (("/bin/sh")  (which "sh"))
+              (("/bin/rm")  (which "rm"))
+              (("/bin\\)")  (string-append (dirname (which "rm")) ")")))
+            #t)))))
+    (inputs `(("readline" ,readline)
+              ("perl" ,perl)))
+    (native-inputs `(("autoconf" ,autoconf)
+                     ("automake" ,automake)
+                     ("libtool" ,libtool)
+                     ("pkg-config" ,pkg-config)))
+    (synopsis "Alternative implementation of the rc shell by Byron Rakitzis")
+    (description
+     "This is a reimplementation by Byron Rakitzis of the Plan 9 shell.  It
+has a small feature set similar to a traditional Bourne shell.")
+    (home-page "http://github.com/rakitzis/rc")
+    (license zlib)))