octopus: Switch to new version structure

pkgs/octopus/libxc.nix

@@ -0,0 +1,30 @@
+{ stdenv, fetchurl, gfortran, perl }:
+
+let
+  common = scripts: version: sha256: stdenv.mkDerivation rec {
+    inherit version;
+    name = "libxc-${version}";
+
+    src = fetchurl {
+      url = "http://www.tddft.org/programs/octopus/down.php?file=libxc/${version}/libxc-${version}.tar.gz";
+      inherit sha256;
+    };
+
+    buildInputs = [ gfortran perl ];
+
+    postPatch = ''
+      patchShebangs ${scripts}
+    '';
+
+    meta = with stdenv.lib; {
+      homepage = http://octopus-code.org/wiki/Libxc;
+      description = "Libxc is a library of exchange-correlation functionals for density-functional theory.";
+      platforms = platforms.all;
+      license = licenses.gpl3;
+    };
+  };
+
+in {
+  libxc404 = common "scripts"       "4.0.4" "1l43wcxn51ivy5wzdwfvvhim6vql82rw8fy5wk6s0p54xikhsgzn";
+  libxc301 = common "src testsuite" "3.0.1" "1xyac89yx03vm86rvk07ps1d39xss3amw46a1k53mv30mgr94rl3";
+}