Add a derivation for the ocsigen server (ocaml webserver)

pkgs/development/ocaml-modules/ocsigen-server/default.nix

@@ -0,0 +1,34 @@
+{stdenv, fetchurl, ocaml, findlib, which, ocaml_react, ocaml_ssl, ocaml_lwt, ocamlnet, ocaml_pcre, cryptokit, tyxml, ocaml_ipaddr, zlib, libev, openssl, ocaml_sqlite3, tree}:
+
+stdenv.mkDerivation {
+  name = "ocsigenserver-2.4.0";
+  
+  src = fetchurl {
+    url = https://github.com/ocsigen/ocsigenserver/archive/2.4.0.tar.gz;
+    sha256 = "1fjj8g6ivyfsa0446w77rjihhbw0gh5pgx7brywql2shk999riby";
+  };
+
+  buildInputs = [ocaml which findlib ocaml_react ocaml_ssl ocaml_lwt ocamlnet ocaml_pcre cryptokit tyxml ocaml_ipaddr zlib libev openssl ocaml_sqlite3 tree];
+
+  configureFlags = "--root $(out) --prefix /";
+
+  dontAddPrefix = true;
+
+  createFindlibDestdir = true;
+
+  postFixup = 
+  ''
+  rm -rf $out/var/run
+  '';
+
+  dontPatchShebangs = true;
+
+  meta = {
+    homepage = http://ocsigen.org/ocsigenserver/;
+    description = "Ocsigen Server is a full featured Web server. It implements most features of the HTTP protocol, and has a very powerful extension mechanism that make very easy to plug your own OCaml modules for generating pages.";
+    license = "LGPL"; # <- todo: check
+    platforms = ocaml.meta.platforms;
+    maintainers = [ stdenv.lib.maintainers.gal_bolle ];
+  };
+
+}

pkgs/top-level/all-packages.nix

@@ -3401,6 +3401,8 @@ let
 
     ocaml_text = callPackage ../development/ocaml-modules/ocaml-text { };
 
+    ocsigen_server = callPackage ../development/ocaml-modules/ocsigen-server { };
+
     ounit = callPackage ../development/ocaml-modules/ounit { };
 
     tyxml = callPackage ../development/ocaml-modules/tyxml { };