diff --git a/pkgs/development/libraries/tk/8.4.16.nix b/pkgs/development/libraries/tk/8.4.16.nix
new file mode 100644
index 00000000000..c43e53cc827
--- /dev/null
+++ b/pkgs/development/libraries/tk/8.4.16.nix
@@ -0,0 +1,18 @@
+args: with args;
+
+stdenv.mkDerivation {
+  name = "tk-${version}";
+  src = fetchurl {
+    url = "mirror://sourceforge/tcl/tk${version}-src.tar.gz";
+    sha256 = "0cciavzd05bpm5yfppid0s0vsf8kabwia9620vgvi26sv1gjgwhb";
+  };
+  postInstall = ''
+    echo -e '#! /bin/sh \n $( readlink -f $( which wish${__substring 0 3 version}) ) "$@"' >$out/bin/wish
+    chmod a+x $out/bin/wish
+  ''; 
+  configureFlags="--with-tcl=${tcl}/lib";
+  preConfigure = "cd unix";
+
+  buildInputs = [tcl x11];
+  inherit tcl;
+}
diff --git a/pkgs/development/libraries/tk/builder.sh b/pkgs/development/libraries/tk/builder.sh
deleted file mode 100644
index 999488a3531..00000000000
--- a/pkgs/development/libraries/tk/builder.sh
+++ /dev/null
@@ -1,10 +0,0 @@
-source $stdenv/setup
-
-configureFlags="--with-tcl=$tcl/lib"
-preConfigure() {
-  cd unix
-}
-
-preConfigure=preConfigure
-
-genericBuild
diff --git a/pkgs/development/libraries/tk/default.nix b/pkgs/development/libraries/tk/default.nix
deleted file mode 100644
index 9e0a6b8c0da..00000000000
--- a/pkgs/development/libraries/tk/default.nix
+++ /dev/null
@@ -1,12 +0,0 @@
-{stdenv, fetchurl, tcl, x11}:
-
-stdenv.mkDerivation {
-  name = "tk-8.4.16";
-  builder = ./builder.sh;
-  src = fetchurl {
-    url = mirror://sourceforge/tcl/tk8.4.16-src.tar.gz;
-    sha256 = "0cciavzd05bpm5yfppid0s0vsf8kabwia9620vgvi26sv1gjgwhb";
-  };
-  buildInputs = [tcl x11];
-  inherit tcl;
-}
diff --git a/pkgs/tools/networking/socat/1.6.0.0.nix b/pkgs/tools/networking/socat/1.6.0.0.nix
index 80dd1276a10..1e176f47720 100644
--- a/pkgs/tools/networking/socat/1.6.0.0.nix
+++ b/pkgs/tools/networking/socat/1.6.0.0.nix
@@ -6,15 +6,14 @@ args : with args; with builderDefs {src="";} null;
             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";
-        };
-        
+          (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 = [];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 51f94b858d7..6ac651b05e2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2660,10 +2660,13 @@ rec {
 	qt = qt4;
   };
 
-  tk = import ../development/libraries/tk {
+  tkFun = lib.sumArgs (selectVersion ../development/libraries/tk) {
     inherit fetchurl stdenv tcl x11;
+    version = "8.4.16";
   };
 
+  tk = tkFun null;
+
   unixODBC = import ../development/libraries/unixODBC {
     inherit fetchurl stdenv;
   };