bug#26984: Add loksh (ported OpenBSD pdksh)

[ng0 <ng0@pragmatique.xyz>]

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The first patch adds loksh, a port of OpenBSD pdksh to Linux userland.
Intended for musl build, but we don't have that now.
It seems to work, I use it.
-- 
https://pragmatique.xyz
PGP: https://people.pragmatique.xyz/ng0/

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From b72f88bfa8c3f26fcac4a0c0e9ef07a76e727fcf Mon Sep 17 00:00:00 2001
From: ng0 <ng0@no-reply.pragmatique.xyz>
Date: Thu, 18 May 2017 16:55:12 +0000
Subject: [PATCH] gnu: Add loksh.

* gnu/packages/shells.scm (loksh): New variable.
---
 gnu/packages/shells.scm | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/gnu/packages/shells.scm b/gnu/packages/shells.scm
index 4e684e8c8..5035c935a 100644
--- a/gnu/packages/shells.scm
+++ b/gnu/packages/shells.scm
@@ -32,6 +32,7 @@
   #:use-module (gnu packages bison)
   #:use-module (gnu packages documentation)
   #:use-module (gnu packages groff)
+  #:use-module (gnu packages libbsd)
   #:use-module (gnu packages libedit)
   #:use-module (gnu packages ncurses)
   #:use-module (gnu packages pcre)
@@ -457,3 +458,39 @@ components: a process notation for running programs and setting up pipelines
 and redirections, and a complete syscall library for low-level access to the
 operating system.")
       (license bsd-3))))
+
+(define-public loksh
+  (package
+    (name "loksh")
+    (version "6.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://github.com/dimkr/loksh/archive/"
+                           version ".tar.gz"))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "1wg7ds56yr8fgg1m149bi53bvrwccwiashmwknggza1sqgj9m2lq"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("libbsd" ,libbsd)))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (arguments
+     `(#:tests? #f ;No tests included
+       #:make-flags (list "CC=gcc" "HAVE_LIBBSD=1"
+                          (string-append "DESTDIR="
+                                         (assoc-ref %outputs "out"))
+                          "PREFIX=")
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure)))) ;No configure script
+    (home-page "https://github.com/dimkr/loksh")
+    (synopsis "Port of OpenBSD pdksh to Linux")
+    (description
+     "loksh is a Linux port of OpenBSD's ksh (pdksh).
+It is a small, interactive shell targeted at resource-constrained systems.")
+    ;; The file 'LEGAL' says it is the public domain, and the 2
+    ;; exceptions which are listed are not included in this port.
+    (license public-domain)))
-- 
2.13.0