Added bolt-1.4

pkgs/development/ocaml-modules/bolt/default.nix

@@ -0,0 +1,41 @@
+{ stdenv, fetchurl, ocaml, findlib, which }:
+
+let inherit (stdenv.lib) getVersion versionAtLeast; in
+
+assert versionAtLeast (getVersion ocaml) "4.00.0";
+assert versionAtLeast (getVersion findlib) "1.3.3";
+
+stdenv.mkDerivation rec {
+
+  name = "bolt-1.4";
+
+  src = fetchurl {
+    url = "https://forge.ocamlcore.org/frs/download.php/1043/${name}.tar.gz";
+    sha256 = "1c807wrpxra9sbb34lajhimwra28ldxv04m570567lh2b04n38zy";
+  };
+
+  buildInputs = [ ocaml findlib which ];
+
+  # The custom `configure` script does not expect the --prefix
+  # option. Installation is handled by ocamlfind.
+  dontAddPrefix = true;
+
+  createFindlibDestdir = true;
+
+  buildFlags = "all";
+
+  doCheck = true;
+  checkTarget = "tests";
+
+  meta = with stdenv.lib; {
+    homepage = "http://bolt.x9c.fr";
+    description = "A logging tool for the OCaml language";
+    longDescription = ''
+      Bolt is a logging tool for the OCaml language. It is inspired by and
+      modeled after the famous log4j logging framework for Java.
+    '';
+    license = licenses.lgpl3;
+    platforms = ocaml.meta.platforms;
+    maintainers = [ maintainers.jirkamarsik ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -3446,6 +3446,8 @@ let
 
     ansiterminal = callPackage ../development/ocaml-modules/ansiterminal { };
 
+    bolt = callPackage ../development/ocaml-modules/bolt { };
+
     camlidl = callPackage ../development/tools/ocaml/camlidl { };
 
     camlp4 =