diff --git a/pkgs/shells/zsh/default.nix b/pkgs/shells/zsh/4.3.4.nix
similarity index 88%
rename from pkgs/shells/zsh/default.nix
rename to pkgs/shells/zsh/4.3.4.nix
index 0b227b031b82..ea9a82cf6839 100644
--- a/pkgs/shells/zsh/default.nix
+++ b/pkgs/shells/zsh/4.3.4.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, coreutils, ncurses}:
+args: with args;
 stdenv.mkDerivation {
   name = "zsh-4.3.4";
 
diff --git a/pkgs/shells/zsh/4.3.5.nix b/pkgs/shells/zsh/4.3.5.nix
new file mode 100644
index 000000000000..227da7995fb4
--- /dev/null
+++ b/pkgs/shells/zsh/4.3.5.nix
@@ -0,0 +1,22 @@
+args: with args;
+let documentation = fetchurl {
+    url = http://www.math.technion.ac.il/pub/zsh/zsh-4.3.5-doc.tar.bz2;
+    sha256 = "0jf35xibp8wfka7rdk9q8spkwprlhjx1sp7vp6img8wks12cvlkx";
+  };
+in
+stdenv.mkDerivation {
+  name = "zsh-${version}";
+
+  src = fetchurl {
+    url = http://www.math.technion.ac.il/pub/zsh/zsh-4.3.5.tar.bz2;
+    sha256 = "0191j3liflkjrj39i2yrs3ab9jcx4zd93rirx3j17dymfgqlvrzb";
+  };
+  configureFlags = "--with-tcsetpgrp --enable-maildir-support --enable-multibyte";
+
+  postInstall = ''
+    ensureDir $out/share/
+    tar xf ${documentation} -C $out/share
+  '';
+
+  buildInputs = [ncurses coreutils];
+}
diff --git a/pkgs/tools/networking/socat/1.6.0.0.nix b/pkgs/tools/networking/socat/1.6.0.0.nix
new file mode 100644
index 000000000000..80dd1276a104
--- /dev/null
+++ b/pkgs/tools/networking/socat/1.6.0.0.nix
@@ -0,0 +1,35 @@
+args : with args; with builderDefs {src="";} null;
+    let localDefs = builderDefs (rec {
+        src = /* put a fetchurl here */
+        fetchurl {
+            url = http://www.dest-unreach.org/socat/download/socat-1.6.0.0.tar.bz2;
+            sha256 = "1j01iazwfr63q71cfcfzrdz8digqlg3ldhlbb72yl5mn9awr0w0m";
+        };
+        patches = [
+        fetchurl {
+            url = http://www.dest-unreach.org/socat/contrib/socat-servicenames.patch;
+            sha256 = "1r8zd6mk257n01i34i5syxl2k6fr35nlr7bqs9sfc79irjl62z66";
+        };
+        fetchurl {
+            url = http://www.dest-unreach.org/socat/contrib/socat-maxfds.patch.gz;
+            sha256 = "0fsn0k0qsrdbjbhj09a6kxfsxb7yhxs4cad26znd9naginsj7pxa";
+        };
+        
+        ];
+        buildInputs = [openssl];
+        configureFlags = [];
+    }) null; /* null is a terminator for sumArgs */
+    in with localDefs;
+stdenv.mkDerivation rec {
+    name = "socat-"+version;
+    builder = writeScript (name + "-builder")
+        (textClosure localDefs 
+            [doPatch doConfigure doMakeInstall doForceShare doPropagate]);
+    meta = {
+        description = "
+        Socat, one more analogue of netcat, but not mimicking it.
+	'netcat++' (extended design, new implementation)
+";
+        homepage = "http://www.dest-unreach.org/socat/";
+    };
+}
diff --git a/pkgs/tools/networking/socat/2.0.0-b1.nix b/pkgs/tools/networking/socat/2.0.0-b1.nix
new file mode 100644
index 000000000000..5fb3fee78791
--- /dev/null
+++ b/pkgs/tools/networking/socat/2.0.0-b1.nix
@@ -0,0 +1,25 @@
+args : with args; with builderDefs {src="";} null;
+    let localDefs = builderDefs (rec {
+        src = /* put a fetchurl here */
+        fetchurl {
+            url = http://www.dest-unreach.org/socat/download/socat-2.0.0-b1.tar.bz2;
+            sha256 = "0ybd5fw22icl10r33k987rskh9gvysm1jph90a1pfdjj57cy44fk";
+        };
+        
+        buildInputs = [openssl];
+        configureFlags = [];
+    }) null; /* null is a terminator for sumArgs */
+    in with localDefs;
+stdenv.mkDerivation rec {
+    name = "socat-"+version;
+    builder = writeScript (name + "-builder")
+        (textClosure localDefs 
+            [doPatch doConfigure doMakeInstall doForceShare doPropagate]);
+    meta = {
+        description = "
+        Socat, one more analogue of netcat, but not mimicking it.
+	'netcat++' (extended design, new implementation)
+";
+        homepage = "http://www.dest-unreach.org/socat/";
+    };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 99f714a873c1..51f94b858d79 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -774,6 +774,13 @@ rec {
 
   smbfsFuse = smbfsFuseFun null;
 
+  socatFun = lib.sumArgs (selectVersion ../tools/networking/socat) {
+    version = "1.6.0.0";
+    inherit builderDefs openssl;
+  };
+
+  socat = socatFun null;
+
   sudo = import ../tools/security/sudo {
     inherit fetchurl stdenv coreutils pam;
   };
@@ -923,10 +930,13 @@ rec {
     inherit fetchurl stdenv ncurses;
   };
 
-  zsh = import ../shells/zsh {
+  zshFun = lib.sumArgs (selectVersion ../shells/zsh) {
     inherit fetchurl stdenv ncurses coreutils;
+    version = "4.3.5";
   };
 
+  zsh = zshFun null;
+
 
   ### DEVELOPMENT / COMPILERS