* libxml2 2.7.4. Quite a few packages depend on libxml2, so this

isn't the default yet.

svn path=/nixpkgs/trunk/; revision=17245

pkgs/development/libraries/libxml2/2.7.4.nix

@@ -0,0 +1,27 @@
+{stdenv, fetchurl, zlib, python ? null, pythonSupport ? true}:
+
+assert pythonSupport -> python != null;
+
+stdenv.mkDerivation {
+  name = "libxml2-2.7.4";
+
+  src = fetchurl {
+    url = ftp://xmlsoft.org/libxml2/libxml2-sources-2.7.4.tar.gz;
+    sha256 = "1psk9r69z02cmjpbixs89qj0zprfyi6xc598j51cc0gah0h3wq03";
+  };
+
+  configureFlags = ''                                                  
+    ${if pythonSupport then "--with-python=${python}" else ""}         
+  '';
+  
+  propagatedBuildInputs = [zlib];
+
+  setupHook = ./setup-hook.sh;
+
+  passthru = {inherit pythonSupport;};
+
+  meta = {
+    homepage = http://xmlsoft.org/;
+    description = "A XML parsing library for C";
+  };
+}

pkgs/top-level/all-packages.nix

@@ -3844,6 +3844,12 @@ let
     pythonSupport = false;
   };
 
+  # !!! Merge later.
+  libxml2New = makeOverridable (import ../development/libraries/libxml2/2.7.4.nix) {
+    inherit fetchurl stdenv zlib python;
+    pythonSupport = false;
+  };
+
   libxml2Python = libxml2.override {
     pythonSupport = true;
   };