empty: init at 0.6.21b

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

pkgs/tools/misc/empty/0.6-Makefile.patch

@@ -0,0 +1,13 @@
+diff --git a/Makefile b/Makefile
+index 1fe4c41..2c69558 100644
+--- a/Makefile
++++ b/Makefile
+@@ -16,7 +16,7 @@ LIBS =	-lutil
+ PREFIX = /usr/local
+ 
+ all:
+-	${CC} ${CFLAGS} -Wall ${LIBS} -o empty empty.c
++	${CC} ${CFLAGS} -Wall -o empty empty.c ${LIBS}
+ 
+ FreeBSD:	all
+ NetBSD:		all

pkgs/tools/misc/empty/default.nix

@@ -0,0 +1,46 @@
+{ fetchzip, lib, stdenv, which }:
+
+stdenv.mkDerivation rec {
+  pname = "empty";
+  version = "0.6.21b";
+
+  src = fetchzip {
+    url = "mirror://sourceforge/${pname}/${pname}/${pname}-${version}.tgz";
+    sha256 = "1rkixh2byr70pdxrwr4lj1ckh191rjny1m5xbjsa7nqw1fw6c2xs";
+    stripRoot = false;
+  };
+
+  patches = [
+    ./0.6-Makefile.patch
+  ];
+
+  nativeBuildInputs = [ which ];
+
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  postPatch = ''
+    rm empty
+  '';
+
+  meta = with lib; {
+    homepage = "http://empty.sourceforge.net";
+    description = "A simple tool to automate interactive terminal applications";
+    license = licenses.bsd3;
+    platforms = platforms.all;
+    longDescription = ''
+      The empty utility provides an interface to execute and/or interact with
+      processes under pseudo-terminal sessions (PTYs). This tool is definitely
+      useful in programming of shell scripts designed to communicate with
+      interactive programs like telnet, ssh, ftp, etc. In some cases empty can
+      be the simplest replacement for TCL/expect or other similar programming
+      tools because empty:
+
+      - can be easily invoked directly from shell prompt or script
+      - does not use TCL, Perl, PHP, Python or anything else as an underlying language
+      - is written entirely in C
+      - has small and simple source code
+      - can easily be ported to almost all UNIX-like systems
+    '';
+    maintainers = [ maintainers.djwf ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -4099,6 +4099,8 @@ in
 
   emem = callPackage ../applications/misc/emem { };
 
+  empty = callPackage ../tools/misc/empty { };
+
   emulsion = callPackage ../applications/graphics/emulsion {
     inherit (darwin.apple_sdk.frameworks) AppKit CoreGraphics CoreServices Foundation OpenGL;
   };