Add libiodbc

Use experimental style. Will revert to "standard" one if needed.

svn path=/nixpkgs/trunk/; revision=20929

pkgs/development/libraries/libiodbc/default.nix

@@ -0,0 +1,22 @@
+a:
+
+let
+  inherit (a) stdenv fetchurl pkgconfig cg;
+  inherit (a.gtkLibs) gtk;
+in
+
+stdenv.mkDerivation rec {
+  name = "libiodbc-3.52.7";
+
+  src = fetchurl {
+    url = "${meta.homepage}/downloads/iODBC/${name}.tar.gz";
+    sha256 = "d7002cc7e566785f1203f6096dcb49b0aad02a9d9946a8eca5d663ac1a85c0c7";
+  };
+
+  buildInputs = if cg "gtk" false then [ gtk pkgconfig ] else [];
+
+  meta = {
+    description = "iODBC driver manager";
+    homepage = http://www.iodbc.org;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -4280,6 +4280,9 @@ let
     inherit stdenv fetchurl perl;
   };
 
+  libiodbc = makeOverridable (import ../development/libraries/libiodbc)
+    (pkgs // { cg = getPkgConfig "libiodbc"; });
+
   libnice = import ../development/libraries/libnice {
     inherit stdenv fetchurl pkgconfig;
     inherit (gnome) glib;